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

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.

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.

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.

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.

Grace ends up in the middle of what could be a plot by an anti-government group linked to the recent death of a police officer, as she reaches out to Neely, the young drug addict who shares visions of Earl. Grace's clumsy, off-the-books investigation causes Neely to become injured. Meanwhile, Grace and ham get caught in a compromising position, and Butch makes a surprise announcement.

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.

As Grace deals with the aftermath of her dramatic fall from a building with Neely, she also struggles with the impending death of her grandfather, GeePaw (guest star August Schellenberg). Meanwhile the squad investigates a double homicide involving a water dispute between two ranchers, and Rhetta discovers a secret about her daughter.