Grace and her team investigate the murder of a manager of a sleazy local motel. The investigation eventually leads to a maid, who claims the victim was trying to rape her. Complications arise when a local priest offers her the right of sanctuary. Meanwhile, Grace begins to accept Earl's presence in her life.

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.

The death of an alleged call girl in a flight attendant’s uniform leads Grace and the guys to investigate a notorious Oklahoma crime family. Grace is finally confronted by Ham’s wife about the affair. A financially-strapped Rhetta gets excited about making two grand as an expert witness. And Grace and Rhetta hatch a secret plan for Rhetta to meet Earl.

Grace and the guys investigate the murder of a “crispy critter” in the Oklahoma countryside and Bobby soon discovers the deceased was one of his mentees. Grace enlists the help of her Native American grandfather, “Geepaw,” to help with the case, but is shocked when she sees how quickly his health is deteriorating. Grace and her sister, Paige, fight over many things, including Geepaw’s future in a nursing home. Earl tries to make Grace realize the importance of family… and Grace and Butch rekindle their passion.

During the raid on a killer's house, Grace gets shot and almost dies, while another policeman isn't as lucky as her and gets shot to death. Meanwhile, Leon Cooley has to deal with his ex-wife marrying another man, who might adopt his son.

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

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

Summer finale. A prominent doctor fatally wounds an intruder in his house, but Grace feels the doctor's story isn't exact. Ham breaks some interesting news to Grace, and Earl tells her she will need to help Neely.

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.

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.

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 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.

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.

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.

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.

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 friend of Grace's doesn't want any help in the possible murder of her husband. The squad has little time to waste in trying to track down and a missing person with brain damage. Grace tries to find out exactly when Earl began following her.

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 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.

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.

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.