After the bodies of two young L.A. transplants are found poisoned, Chloe and Lucifer hunt for the killer. Upon Maze convincing Chloe to go out for drinks, which the detective perceives as an act of friendship, but is actually part of a bet between Maze and Lucifer, the two make a shocking decision.
Guilty and self-destructive, Lucifer clashes with Chloe during an investigation, leading her to team up with Dan instead. Meanwhile, Amenadiel bonds with Charlotte, and Maze takes Trixie trick-or-treating.
Lucifer and Chloe investigate a mysterious masked killer who is poisoning college students. They also try to make sense of their new relationship, after a long-awaited kiss. Meanwhile, Charlotte visits Linda for advice on a touchy subject.
Lucifer has gone off the grid and cut off all contact from his family and the police department, following Chloe's near-death. But the murder of an up-and-coming guitarist causes him to resurface - with a new mystery woman. Meanwhile, Lucifer's mom realizes she may have found a way to finally get them back to Heaven.
Lucifer attempts to control his emotions when he learns the flaming sword is the only way the family can return home. In the meantime, a therapist and head of admissions at a prestigious private school is found dead.
Charlotte accidentally burns a man to death, leaving Lucifer to keep Chloe from figuring what really happened, so he puts Maze in charge of locating Charlotte and Amenadiel, who have both gone missing. Meanwhile, Lucifer seeks a permanent solution for the ticking-time-bomb that is his mother.