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 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.

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 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 cuddled 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.

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

While trying to catch a hugger who has been hurting women, Grace has trouble with a new partner.

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 cuddle; Grace has suspicions about Abby; Rhetta and Johnny meet with Leon.

As Grace investigates the passing of a woman in an architect's home she learns about his sex life. Ham hopes to get to romantic again with Grace as her partner. Bobby's undercover work ends badly. Clay makes a new friend.

Doug dates a bartender and Clay's dad is back on the dating scene. Grace isn't sure how Clay will take the news. The passing of a jogger give the team some clues about his life. A classmate from high school visits Leon.

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 and her team investigate the shooting. Grace and discovers something about Leon that may cause her to consider stopping the execution, also Grace is a step closer to marrying Ham.