Good Behavior follows Letty Raines, a thief and con artist who is always one bad decision from implosion. Fresh out of prison, she's attempting to stay afloat. But when she overhears a hit man being hired to kill a man's wife, she sets out to derail the job, sending her on a wild collision course with the killer.
Fresh out of prison, Letty tries to stay afloat and reunite with her 10-year-old son, who is currently being raised by her mother Estelle. Letty has to show up for mandatory check-ins with her parole officer Christian, whose motives for helping her are questionable. Chaos returns to Letty's life when she overhears a hitman being hired to kill a man's wife, and sets out to derail the job. She soon finds herself dangerously entangled with the killer.
With Jacob finally in their custody, Letty and Javier settle in a quaint beach town; when a hit goes wrong for Javier, Letty must face the reality of being in a relationship with a hit man while trying to lead a normal life.
Javier heads out on his annual solo camping trip to commemorate the death of his baby brother, but Letty discovers that this is a lie and Javier has accepted an assignment; Ava's ex-boyfriend from Argentina shows up amid unusual circumstances.
Letty and Javier go on Christmas vacation with Estelle and Rob to a secluded luxury hotel in the mountains; a man following Estelle threatens the family's holiday; Christian and FBI agent Lashever have their own private getaway.