In attempt to find the contents of his stolen container, Lucifer enlists the help of an unlikely ally. Meanwhile, Chloe digs deeper into the Palmetto case, uncovering a lead that might finally expose the truth.

Lucifer and Chloe are tasked with solving the murder of a prominent restaurateur. When they meet his son, they suspect he played a part in the death. Meanwhile, Chloe's mom returns home, sending Chloe's life into upheaval, as Lucifer learns his own dysfunctional family isn't nearly as unique as he thought.

Lucifer and Chloe investigate a gruesome murder after a video of the crime surfaces on social media. When a second video appears, they realize they have a serial killer on their hands. Meanwhile, Lucifer’s mom returns as Charlotte Richards. Also, Amenadiel, struggling with his loss of power, has an appointment with Linda.

Lucifer and Chloe investigate a mysterious masked killer who is poisoning college students.

After talking to Lucifer and Linda, Maze realizes that she is looking for more out of life and decides to head to Canada for a tricky case. Chloe however, becomes concerned when she feels that Maze is being deceived by a scheming conman. Upon further investigation, Lucifer and Chloe make a stunning realization when they find that their target may be much closer than they thought.

After Lt. Pierce's true identity is revealed, Lucifer tries to figure out his motives. In order to earn Chloe's assistance in his investigation of Pierce, Lucifer goes above and beyond to help her solve the murder of a professional surfer. Meanwhile, Amenadiel deals with a personal health issue.

As Chloe and Lucifer go on the hunt for a serial killer targeting couples in love, Pierce realizes the case is connected to a murder he previously solved...in 1958. Then, Lucifer becomes upset when Pierce has a change of heart about an important decision.

When a prima ballerina is brutally murdered, Lucifer helps Chloe solve the case and attempts to keep her focus away from Pierce. Amenadiel begs Charlotte to help him with an important plan, and Maze remains devoted to a task from which Pierce asked her to back away. Then, Chloe confronts Lucifer about his meddling in her life, but as he's about to make a huge confession, he finds out something that changes everything.