Everybody can't figure out why Capt. Perry seems to be on an edge all the time. Rhetta and Ronnie learn to communicate better since the start of their relationship with Johnny.

Grace returns to Oklahoma City long rejuvenated and with a new perspective on how to deal with crime. Her family is still trying to grasp with exactly what happened.

The team investigates a woman's death, while Grace seems captivated by the prime suspect, a high-profile architect and her unusual sex life. Meanwhile, Grace and Ham partner up once again, with hopes that their romance will be rekindled by the union. Elsewhere, Bobby's undercover case leads to an explosive conclusion, and Clay forms a bond with a young kid.

3 children are killed in a bus accident and Grace's investigation is interrupted by bad weather as tornadoes rip through the city.

Butch's reporter girlfriend covers the bizarre slaying of a drug company whistle blower in hopes for a big national scoop. Elsewhere, Grace's brother believes his neighbor has a dead body inside his home; and Johnny hopes to finally meet Grace's last-chance angel.

A 17-year-old devout Christian comes under attack just days before he’s scheduled to testify in a murder trial. In order to ensure his safety, Grace allows him to move in with her. But Grace can only handle so much preaching, so she ropes the guys into helping her watch over him. Grace gets pissed when Earl uses Leon Cooley and her nephew, Clay, to get her attention.

Doug and Maggie's romance has flourished so much that they set their wedding date, but the date may be put on hold when Maggie is attacked by an unknown predator. Meanwhile, Johnny and Rhetta try passionately to save Leon from his upcoming execution by starting a petition. And young Clay continues bonding with Leon's son.

The team is focused on a series of brutal home break-ins, but the latest one seems different than the others. Meanwhile, Matthew, a fellow angel of Earl's, is having trouble saving souls, and hones in on Earl's space.

A defense attorney from Los Angeles comes to town for a murder trial and his presence may influence the team in professional and personal areas of their lives.

A home for the mentally challenged is the target area of investigation when a robbery occurs involving a man with Down Syndrome.

Grace takes on an investigation when a jogger with a intricate love life is found dead. Meanwhile, Clay's father and a new bartender from a local joint begin dating, and Grace worried that this will have a negative impact on Clay. Leon gets a visit from a former high school classmate.

Grace is called to the crime scene where there is blood everywhere but no body; Ham and his wife separate; a ketchup and mustard incident becomes a running joke around the squad room.

A teenage girl dies at a school friend's party that Grace's niece was at; Grace has a new partner; Johnny tries to learn more about Earl.

As the squad investigates a fatal shooting by an elderly woman, Leon Cooley’s execution date arrives. Grace, who has discovered that Leon once helped her sister and was invited to a family birthday party, struggles with whether or not to lend a hand towards stopping the execution. Grace also finds a connection with a young woman, who may also be getting visits from Earl. And Ham’s divorce is finalized, which he hopes will make things between him and Grace more permanent.

The squad's evidence supervisor is found dead in a bathroom stall at the local cop hang-out; Ham's brother comes to visit before being deployed; Grace and Leon dream about each other.

Grace struggles with what she should do about father Murphy. Off duty from calling in sick she winds up capturing number six on the FBI's most wanted list while meeting Gretta. After Grace brings in father Murphy he winds up dead and she's suspected.

Grace has trouble dealing with a food issue and doesn't go to anybody for help to deal with it. Neely's having trouble when her drug problem spirals out of control. A friend of Butch's needs help getting out of a tough situation.

Grace may be able to tell God all the things she has done through her life because of her bond with Earl.

The team blows Bobby's cover when they investigate a murder; Grace has suspicions about Abby; Rhetta and Johnny meet with Leon.

A woman is brutally murdered and her son is abducted; the squad works frantically to find the missing boy; Bobby surprises the squad and his family by going under cover; Ham continues to struggle with his personal loss.

In the immediate aftermath of Grace and Neely’s survived fall from the top of a building, Grace, now known as “Angel Cop” by the city, decides to have it out with God once and for all. But a mysterious stranger might have something to say about that. Ham struggles with his father over the fact that Ham is now dating his dead brother’s widow. And the squad investigates a deadly mauling by a dog.

Grace and her team investigate the murder of an oilman. Meanwhile, Ham discovers Grace's romantic past with Butch Stillwater, which puts a strain on their relationship. Grace sets out to prove her courage by challenging Earl to a wrestling match.

Grace Hanadarko is an Oklahoma City police detective with an alcohol problem and a self-destructive lifestyle. After she hits a man with her car while driving drunk, she asks God for help and an angel named Earl appears. Earl wants to help her find the right path of life again, but it is going to be a hard piece of work for both of them.

During a case that puts Grace’s spirituality to the test, the squad investigates the murder of a Hasidic Jew whose body is found near a herd of dead cows. Meanwhile, Grace tries to connect with Neely, and Ham’s sister-in-law, Amanda, struggles to get over the death of her husband.

A mother goes missing; Clay joins the OCPD Explorers program against his father's wishes and confronts Ham about his affair with Grace; Butch becomes the target of a stalker.

The squad tracks down a serial killer who has been mutilating women; Ham is temporarily partnered with Butch during Bobby's absence; Earl tries to persuade Grace to help Leon.

Grace and her crew investigate the unusual suicide of a court reporter, and conclude the crime was staged. Elsewhere, Grace tries forming a bond with Neely, despite the fragile physical state of the young drug abuser; and Rhetta is close to losing something very special to her.

The squad investigates the death of a parole officer with a secret life, while Grace and her brother Johnny finally track down Neely, the young addict who shares visions of Earl. And Rhetta decides to make some personal changes in the wake of her troubles at home.