Grace must cope with survivor's guilt after a fall off a building. Captain Perry has an announcement that could change everything. The squad looks into a murder mystery.

Grace and Ham play cops and robbers with toy guns. Grace’s favorite Aunt Cathy comes to town – has a run in with Earl, clashes with Betty – and reveals some shocking news. But first-- Rhetta, Grace, and Aunt Cathy get drunk and remember old times. Meanwhile, cattle tycoon Alvin Green’s world begins to crumble after his lucky bull statue is stolen. He insists Major Crimes take the case. When Grace’s father has a fire station named after him, Grace’s family comes together for the dedication ceremony. Henry’s cat dies and Grace comforts him the only way she knows how.

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 photo of Grace's sister, Paige, is found in a burning car.

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.

Grace pursues a rape and kidnapping suspect on foot and disappears, possible as a victim herself. But nothing concerning this seems to make sense, including how Earl works the works the investigation. Ham and Rhetta must team up to find Grace before a shocking ending which will leave a lasting impression on the series.

The squad investigates the death of a 99-year-old man who has been shot in the head sitting in his home. The case, which resembles a crime that happened in Tulsa three years ago, offers Grace and Perry an opportunity to utilize their expertise in gambling-related crimes from the vice days.  It also gives Bobby a chance to reconnect with his dad and Ham a chance to connect with a kindred spirit. But Grace’s attention is drawn towards Rhetta when she learns something unexpected about Ronnie.

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.

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.

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.

A crime from 11 years ago is on Grace's thoughts due to a new case.

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.

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.

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.

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.

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.

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.

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.

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

A young Mexican woman dies at the hospital after being dropped off by a known white supremacist; Ham continues to struggle.

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.

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.

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.

A large stash of money is found in Grace's car when the door is knocked off by a drunken driver; Ham's little brother disappears in Afghanistan.

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.