Frost considers retiring from the Police force and plans to get married, ending the series, however DS George Toolan dies of heart failure following a collision outside the church where the wedding is about to take place. It is noteworthy that an alternate ending was filmed, where Frost is killed instead of George, but David Jason chose the 'happier' ending over this one.

Frost investigates two domestic cases. The first is the tragically straightforward murder of a cantankerous old man by his wife. The other is a more cruelly deceptive one, in which a man is killed, and his son and one of his daughters go missing: Frost tracks them down to Blackpool, where she has gone for an abortion - but who was the father? The answer leads him and DS Barnard into a tragic confrontation with an armed and dangerous paedophile.

DI Frost pursues a paedophile suspected of abducting a 10-year-old boy from a Denton Town football match. Initially, Frost is unsure whether the lad simply ran away or is genuinely the victim of a kidnapping, but when the boy is found dead and a man is found dead following a hit and run incident, the identity of the latter creates a frightening link to the missing child. When a second child turns up dead in a deserted quarry, Frost is in a desperate race against time to stop a third child being murdered. While Frost is contending with this a note arrives from a secret admirer and Mullet tries to push Frost into a promotion he doesn't want.

The first in the final two-part episode in the series sees Frost attempting to crack an illegal dog-fighting ring, only to discover that its manager, a wealthy Denton businessman, has links to a drug-smuggling operation. Frost also begins to form a relationship with RSPCA Inspector Christine Moorhead, and attempts to finally get over the death of his wife.

Frost responds to a call for help but, when he arrives at the scene, all he finds is a disembodied leg… and a crocodile!

With the railroad murder solved, Frost tries to come to terms with having an previously unknown daughter. Detective Reid is sent to look for contraband cigarettes, but is found nearly dead on a public toilet. Was he high, or did Frost´s lookalike have anything to do with it? Meanwhile, Frost eliminates suspect after suspect in the surgeon murder, and ends up saving several lives.

Background enquiries turn up two previous deaths, which appear related to the case. But their initial suspect, armed bank-robber Charlie Lehman, turns out to have died in prison over a year earlier. As they work to profile the killer they are hunting, Frost starts to get close to Hartley personally as well as professionally, though neither realises just how closely she is linked to the case until it is almost too late. Frost has a race against time to find where she is being held.

Pole dancers, false passports and murder. A lethal combination of events draws Inspector Jack Frost and his new assistant into a tragic case of lust, greed and death

After a seven-month long suspension, Frost is back on the job. His first case is a floater in Denton River, with £6000 in his pockets. The man also carries with him a list with four sets of mysterious numbers, and the keys to two different cars. The local dance competion is the venue for another drama: a missing con man who recently switched dance partner, and a woman with a Hollywood name and a terrible temper - who keeps on ordering new fridges for her dance partners... But Frost is more interested in getting his teeth back in order after a particularly vicious lollipop.

The murder of a widow soon gives Frost a chance to prove his worth again, but the investigation only reveals an intriguing web of deceit, and it isn't until a forensic psychologist joins the team that they realise a serial killer is at work.

Frost is invited to join fellow George Cross recipients in London. He is instructed to enlist the aid of WPC Hazel Wallace as a decoy to catch a serial rapist, but it exposes her to serious danger.

A vital witness to a gangland killing goes missing before she can give evidence in court, And frost finds himself under pressure to find her and her son before a hitman can get to them. Frost thinks he has won the lottery but he has lost his ticket!

A bus driver and conductress are abducted. Frost is unhappy at being paired with DS Marsh, who made a complaint about him 15 years before.

Denton's last remaining quarry is vandalised. Frost finds a baby in his office and is delighed to discover it belongs to DS (previously WPC) Hazel Wallace. He gets Hazel to look into some burglary's that have been occuring just after removal jobs have been completed. At the quarry a second body is found, which causes them to call the police. The only witness to the murder is an autistic boy, who immediately becomes prime suspect. Frost finds out about some dodgy dealings in the past between the quarry owner and his former partner. The boy escapes through a window and the Officers on duty get a sever telling off.

Upon investigation, Frost discovers that the apparently accidental death of a drug addict was actually murder. He also decides to confront an aspect of his own past.

A young woman is found viciously stabbed to death. Frost consults the victim's personal organiser, from which a trail leads him to a religious community.

Frost is held at gunpoint by a drugs dealer, a Territorial soldier is shot dead on an exercise, and a security van is robbed by a shotgun-wielding gang. Frost investigates the three incidents, and tries to find any links between them. His intrusions onto the army base stir up hostility from the commanding officer.

There is an armed robbery at a local family-run glassworks, in which an employee is shot dead. The owner, who is one of the witnesses, is then threatened, and goes into hiding. The family has a tangled web of personal relationships, which Frost has to understand, in order to find who is doing the threatening. Meanwhile, Shirley Fisher's mother dies, and he fails to attend the funeral. DS Lawson lets business and personal relationships mix, with serious consequences.

Frost's house is burned down, and he moves in with a colleague temporarily. A mysterious, ruthless kidnapper on a motorcycle tests Frost's skills to the limit. It proves a tough case to crack, and for the abducted woman, time is running out.

A body with no identification is found in a local reservoir, and a couple fall victim to a brutal killer in their own home. Frost is assigned a new, female, West Indian detective constable, Ronni Lonnegan, and gets off to a bad start with a few racially-insensitive remarks. He then reluctantly accepts the help of a psychological profiler, psychiatrist Pam Hartley, who he met at a conference. Meanwhile, there is an inspection of Denton Police underway, and Frost's old-fashioned methods are not endearing him to the inspector, so Supt Mullett is forced to give him more support than usual.

A man is released on licence after serving 20 years for the murder of a 14-year-old girl. When the body of her best friend, who disappeared at the same time, is found, Frost has to investigate a 20-year-old murder.

A woman commits suicide naked in public, and Frost connects her death with the later death of a gigolo. He discovers that the dead man had business with several women in Denton. Meanwhile there appears to be a series of break-ins at the local cricket pavilion, and Supt Mullett, who is a member, orders Frost to investigate them as well as the murder.

An odd group of animal rights advocates attempting to sabotage a foxhunt includes a working-class teenager, who is murdered. Then another person associated with the anti-hunt protesters is murdered. His investigations take Frost to tea with a local squire, but Supt Mullett is apprehensive lest he upset the gentry.

An 8-year-old girl is missing, and the last person to have seen her is Billy Conrad, a gentle young man with Down's syndrome, but who appears is hiding something.

Frost's Saturday afternoon is disrupted by the discovery of a man's body floating in the river, and it turns out that he is not who he claimed to be. Events become more intriguing when the star player of a local football team collapses during a press conference, following an incident on the pitch in which he received head injuries.

Frost is assigned a new, West Indian detective constable, Clive Tanner; transferred in to help him investigate a string of commercial burglaries, which leads him to a black family on the local Eastdean estate, that he calls ""the crime academy"", while feeling guilt over the death of one of his informants. Will the arrest of the apparent culprit lead to accusations of police racism?