When the murder of a friend connects him with LAPD Detective Chloe Dancer, Lucifer becomes intrigued with the idea of punishing criminals in the series premiere.

Lucifer suspects his mother, Charlotte, may be involved in a ghastly murder and instructs Maze to watch her while he and Chloe investigate the case. 

Lucifer and Chloe investigate when a video of a murder is posted to social media, Lucifer's mother returns, and Amenadiel makes an appointment with Linda.

Chloe and Lucifer hunt for the killer of two young L.A. transplants who were poisoned, and Maze and Chloe make a shocking decision.

Lucifer enthusiastically investigates the murder of his favourite movie hero, Wesley Cabot, Amenadiel comes clean about this lost power, and Uriel fights with Lucifer over Chloe and their mother.

During an investigation, a self-destructive Lucifer clashes with Chloe, leading her to team up with Dan. Meanwhile, Charlotte and Amenadiel bond, and Trixie goes trick-or-treating with Maze.

After the man convicted of killing Chloe's father is murdered, new clues suggest he was framed. Also, Maze looks for a job and Lucifer tries to learn how to be normal by watching Dan.

Lucifer links Azrael's stolen blade to a string of violent stabbings and enlists Ella's help in locating the sword.

After the owner of the building in which Lux is located is murdered, Lucifer and Chloe search for the killer, Charlotte devises a plan to upset Lucifer and make him want to leave Earth and return to Heaven.

Charlotte tries to turn Chloe against Lucifer in order to get him to leave Earth; Maze begins to question Amenadiel's loyalty.

Lucifer and Chloe investigate the murder of two of Lucifer's ex-flames; Charlotte continues her attempt to manipulate Chloe and Lucifer's romance.

Lucifer and Chloe investigate when a masked killer poisons a college student; Charlotte turns to Linda for advice on a difficult subject. 

Lucifer travels to hell to find the antidote to the professor's poison; while in hell, Lucifer must confront his guilt about Uriel's death; Mom heads to hell to get Lucfer back.

After cutting off all contact from his family and the police department, Lucifer returns to help solve an up-and-coming guitarist's murder, and also has a new woman in his life.

Lucifer must ignite the flaming sword when it's found to be the only hope for the family returning home safely. Meanwhile, a therapist and head of admissions at a prestigious private school turns up dead.

Lucifer struggles with his feelings when he realises the prime suspect of a murder at an insane asylum could be his father. 

When the man who has the last piece of flaming sword is murdered, the piece goes missing; Maze recruits Lucifer to help save Dr. Linda's career and confronts him about his secrets.

After Charlotte accidentally charbroils a man to death in self-defence, Lucifer tries to hide it from Chloe. Maze goes looking for  Charlotte and Amenadiel, and Lucifer tries to find a permanent solution for the ticking time bomb he calls Mom.