When a spate of shootings claims one of Ronnie and Joe's own, Wes Leyton, the pair are left with a race against time as the next target the shooter has in his cross-hairs is CPS boss Henry Sharpe.

The team investigate, when mother and carer Lia Brown is killed by a stray bullet,what the involvement is of 12-year-old Kaden Blake in her death. Kaden is caught up in the local gang culture, so keeping silent is his only protection. DS Matt Devlin is drawn to this damaged boy, saddened to see a life so doomed by circumstance, and furious that local dealer and gang leader Mark Ellis remains untouchable by the law.

Still affected by the death of one of their team, Ronnie and Joe have a new case to deal with when a young mother is stabbed to death in a busy London marketplace.

The case starts with the murder of a doctor in the car park of the hospital where she works. What initially seems like a crime of passion soon unravels into a conspiracy involving senior government officials. Risking their careers, James and Alesha must get to the bottom of this case before another life is destroyed.

A drive-by shooting outside the Old Bailey leaves one police officer dead and another wounded in what appears to be a targeted attack on a witness in an attempted murder trial. However, Ronnie and the team are surprised to learn the gunman was specifically targeting police officers, believing his family victims of a police cover-up. The defense team argues their client has been subjected to racism by the police. Can Jake and Alesha convince the jury that the defendant ought to be tried as a murderer and not a victim?

Lying in a pool of blood, call girl Katka Cizek, seems to have only one admirer capable of her murder. A man with her on the night, a man without an alibi, a man with everything to lose were his secret obsession for her revealed. A seemingly cut and dry case, Alesha, given the reins to lead the cross-examination, begins to suspect someone has reason to frame the accused. Dogged in her pursuit of the truth, she unearths a betrayal of such enormity proving there are no winners in this case.

The police investigate a suspicious fire that resulted in the death of 13 year-old Ian Parnell. His mother Megan managed to escape but the pathologist confirms that Ian died of smoke inhalation. The boy was severely disabled and unable to care for himself. They follow several false leads including an absent father who is behind on his support payments and a couple of neighborhood lads who were known to have harassed the dead boy. In the end, the evidence points to the mother. In court James and Alesha come up against a barrister who refuses all reasonable offers to settle the case. His disdain for his client leads him to mount a series of increasingly ridiculous defenses. When the truth finally emerges, the Crown prosecutors face a moral dilemma.

When a petty criminal makes a deathbed confession to the murder of a teenage girl, Ronnie is left shaken to the core as he is forced to reopen a case he thought he had put to bed fourteen years ago.

When a person is found dead in the cells, Sam becomes the main suspect, leaving Ronnie and Wes facing a race against time for them to get their hands on the real culprit.

A drug sting apparently goes bad resulting in the death of an informant. Devlin feeling something was not right about the situation digs into the past of the involved detective. Unfortunately this brings up a question of Brooks involvement in a drug theft from six years earlier.

A murder investigation is launched when a concerned citizen alerts the police to a shocking video that is spreading like wildfire on the web, in which a teenage girl is attacked and shot.

DS Devlin and DS Brooks investigate the murder of a 13 year-old boy boy, Sean Monroe, the son of a fellow police officer who was killed and put down a storm drain. A note found on the body points to the work of Andrew Dillon, who was sentenced for an earlier racial murder and is serving his sentence. The racial motivation for the killing seems confirmed when a second boy, Dev Desai, is found strangled with the same note in his pocket. However, their investigation leads to a security guard, Marcus Wright, who admits to having encounters with both boys at the shops where he works. He says the boys deaths were God's will and he was simply doing God's work. If Wright is to be believed, it means that Dillon was wrongfully convicted. The case becomes personal when James Steel is accused of having purposely buried a witness statement that would have likely exonerated Dillon. He finds himself in dock but the judge allows him to conduct his own defense.

Stabbed to death while they slept, the killings of David and Elaine Lerner prove a mystery to DS Matt Devlin and DS Ronnie Brooks. Universally loved, there’s not a single lead that points to grievances held or enemies made. The previous owner of the house soon emerges as a much more likely target for attack - Camilla Mallon, a banker embroiled in a hedge fund scandal. Could the brutal murders be a case of mistaken identity? As our Crown Prosecutors navigate this seemingly senseless crime, Jake’s old mentor, Margaret Rumsfield argues the accused should face only manslaughter charges. Without motive, without intent, can our heroes make a murder charge stick?

When two year old Ryan Stark goes missing from a high street merry-go-round, his distraught mother, Kayla reports him kidnapped and a massive police hunt is launched to find the missing toddler. In spite of public appeals and additional police manpower, the search throws up more questions than answers. The legal case uncovers a history of dealings with the social services before Ryan went missing, something which alerts our heroes to the possibility that his mother isn’t being entirely truthful. With more than one suspect and little physical evidence, will Ryan’s family ever learn the truth of what happened to their baby boy?

The frenzied stabbing of a police forensic lab technician unsettles the team in a way they never expected when Detective Sam Casey falls for the killer's next intended victim.

A gay father is found beaten to death and the son that he adopted with his partner is missing. In a race against time, Ronnie and Sam go on the hunt for the missing boy.

When the body of a 16 year old girl is found dead in her home in the middle of the afternoon, the investigating police cannot be sure a crime was even committed. With no forensic evidence and nothing to suggest the victim didn't die of natural causes, Matt and Ronnie question why they have been called out in the first place. However, the mother's victim believes she was raped because she never slept naked. On further investigation, an unlikely murder weapon is uncovered and a likely suspect - someone with whom Crown Prosecutor James Steel has a history. Determined the accused is guilty, James pursues him with every power available. Like a man possessed, he pushes the boundaries of the law to the legal limit. Is our hero persecuting an innocent man or justified in his convictions?

A police officer is killed in a shoot out with a drug dealer. Based on the testimony of another dealer, Brooks and Devlin must determine whether back up was slow to arrive and left the officer to die because he was gay.

Survivor begins with the investigation into the murder of Prison Officer Charlie Tyner who is found shot dead on a council estate in Hackney. It soon comes to light that, rather than being the good clean officer of Her Majesty's Prison Service we first believe him to be, Charlie Tyner is corrupt and taking advantage of his position in prison in a number of ways. There are plenty of prisoners inside with reason enough to want to kill Charlie but, being in prison, they have solid alibis so who killed Charlie and why? Crown Prosecutors James Steel and Alesha Phillips find themselves at odds with their boss, George Castle, who is keen to bring to justice the killer of a prison officer. James and Alesha can't help but feel Tyner's abuse should be brought into consideration when charging the accused. And they have their eye on a much greater prize - a career criminal connected to Tyner who has evaded the justice system for too long. Can James and Alesha convince the key witness to give evidence against a man she claims to love?

A homeless man is found beaten and unconscious in a park. Because he is bipolar his testimony is disjointed and make him unable to identify his attacked. A neighbourhood resident is charged with the premeditated attack.

When a former vice cop is discovered beaten to death in an underpass, DS Ronnie Brooks and DS Matt Devlin find their investigation going in unexpected directions.

When three people are brutally murdered in a shop in central London and a fourth left for dead, Matt and Ronnie are up against the clock to find the killer who they fear could strike again at any moment. The nature of the attack was frenzied and brutal with the killer using a bayonet to slay his victims. With this information and a photofit, Matt and Ronnie are quickly must identify the killer before they strike again. James assumes a straightforward case ahead of him. However, things take an unexpected turn when he learns that the defendant has brilliant legal support. With the case for defence looking very strong, James' only hope is to convince a deluded defendant to accept responsibility for his crimes.

This week's case hits close to home for DS Matt Devlin when investigating the death of a police officer, and his best friend, PS Pete Garvey. Devlin and Garvey had known each other since childhood and when Matt discovers Pete had recently been in contact with their childhood parish priest Jonathan Nugent (Matthew Marsh), his suspicions are alerted as Pete claimed to have been sexually abused by him as a child. With nothing but suspicions and unfounded rumours to go on, a murder charge cannot be brought against Nugent. Now a married man with a family of his own, can Matt really be sure they've got the right man? James and Alesha take an unusual approach in order to bring a charge - any charge - against the accused in a desperate attempt to get the case home.

The mystery surrounding the stabbing of student, Archie Rahman, has our cops chasing their tails when the only clue they have to go on is a library book checked out on the day of his murder. Two students connected to the book have given an alibi for each other but one of them is lying and it's down to our cops to find out which one. When the perpetrator eventually confesses and claims to have acted in self-defence, Alesha is forced to face past demons. It's a delicate balancing act for James who is tasked not only with prosecuting the offender but also with defending a dead victim. Unless the truth of what happened that day is uncovered, a murderer could walk free or an innocent victim be wrongly convicted.

Philip Gardner, a psychiatrist specialising in troubled adolescents, is stabbed to death and Ronnie initially believes that one of his clients is the culprit.

When a teenager is murdered, the alleged killer's defence barrister has an audacious plan up her sleeve.

Over the course of one long day, the team works on three separate cases, including tracking a serial killer, intervening in a family dispute turned murderous, and disproving an accusation of police intimidation. Will all of the team make it through with their careers intact?

For two years, Stephanie Blake (Michelle Bonnard) has been stalked by a man who calls himself 'Giovanni'. She knows nothing about him but he knows everything about her right down to the finest details of what she keeps in her bathroom cabinet. Over time, his e-mails and calls have become more intimidating but without an actual physical threat against her, there is very little the police can do for Stephanie. After initial investigations lead nowhere, the police are forced to abandon the case. Then something happens which shakes our police heroes to their very core. What should be a straightforward prosecution becomes complicated when a key piece of evidence is excluded. Up against Defence Barrister Evelyn Wyndham (Anna Chancellor), James has his work cut out for him. When one of the cops becomes a key witness for the prosecution, the question arises of whether his motivation is genuine or borne out of guilt. Will he perjure himself in order to get the right result?

Ronnie and new partner Joe Hawkins, who has come from the child protection unit, investigate a gruesome double murder where the victims' hands and teeth were removed.

A man found in a park, with his kidney stolen. It seems a respected doctor is involved. George Castle defends a friend in the case.

A night club peppered with bullets. Two victims bleeding out on the floor. The start of a deadly gun rampage through the streets of London. With the media swarming all over the case and a hostage to find, DS Matt Devlin and DS Ronnie Brooks are up against the clock as they try to track down the Bonnie and Clyde duo wreaking havoc on the city streets. Capture is far from closure when defence barrister, Phyllis Gladstone, takes the case on, arguing that one of the pair was more innocent victim than violent killer. Did the defendant act out of fear - beaten and bullied into submission by her partner-in-crime, too terrified to escape and alert the police? With two sides to every story, the team are under pressure to make sure someone is held responsible for a murderous spree that cost five lives.

Following the suspect death of an old woman, Ronnie and Sam are lead to believe that the old woman's carer was to blame.