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.