Holmes and Watson get involved with nuclear security when they investigate the murder of a former Japanese crime syndicate gang member; Capt. Gregson is blindsided by a stunning personal confession from his daughter, a police sergeant.
Bull mounts a defense for a woman on trial for killing her daughter's murderer.
The heat wave in BlueBell causes everyone to lose their inhibitions; Lemon readies herself for George's family.
Zoe tries to win BlueBell's gumbo competition; Lemon is upset when Lavon develops a crush on another woman; Brick and Zoe have to perform a life-saving surgery together.
Zoe tries to win over residents of Bluebell by participating in the Founder's Day parade, but an unfortunate incident only makes matters worse.