After a confused Lucifer wakes up in the middle of the desert with his wings back, he recruits the help of Chloe to help figure out what happened to him and why. Upon doing their own research, they come across a crime scene that could be tied to Lucifer's kidnapping. When the Lancaster Police Department get involved, newcomer Lieutenant Marcus Pierce fails to make a great impression on everyone with his stern demeanor. The investigation goes awry when Lucifer finds himself in another compromising situation and something much darker is revealed.
After Lucifer removes his wings yet again, Linda becomes concerned that he is too focused on tracking down the Sinnerman and neglecting his own well-being. Tensions continue to rise between Lucifer and Chloe, but they realize they must put their differences aside to solve a case in which Lucifer takes a sudden interest. Once Detective Pierce's past is revealed though, everyone realizes that the Sinnerman is much more dangerous than they thought.
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.
When a youth counselor is found murdered, Lucifer and Chloe venture into the world of high-end reform programs to find the killer. Meanwhile, Amenadiel adjusts his lifestyle in an attempt to help Lucifer, and Chloe questions Lt. Pierce's feelings towards her.
When a food chemist is found dead, Lucifer and Chloe's investigation pits them against an unexpected face - criminal defense attorney Charlotte Richards. Everyone is caught off guard when they see her back in the precinct. As Lucifer tries to understand her return, he makes a shocking discovery that helps solve the case.
When Lucifer discovers his ex-fake-wife, Candy, has gone missing, he hightails it to Las Vegas with Ella in tow. Together, the two of them work to find her, but interesting secrets are revealed along the way that could compromise the investigation. Meanwhile, Chloe is upset that Lucifer left on her birthday, so Linda tries to lift her spirits.
A reporter seeks revenge after he discovers that Lucifer has been sleeping with his estranged wife. However, when it's revealed that Linda is the reporter's estranged wife, things get messy. Lucifer's reputation and safety are on the line, especially when a serial killer from the past resurfaces.
When a murder is connected to a celebrity dating app, Lucifer and Chloe question all they know about the world of social media in order to solve the case. Meanwhile, Ella tries to avoid Charlotte, and Amenadiel helps Linda deal with the death of her ex-husband.
Lucifer is worried when he realizes that recipients of his favors start to turn up dead. After he and Chloe investigate, they are finally brought face-to-face with the Sinnerman. Meanwhile, Detective Pierce returns to work after taking a bullet, Charlotte finds a new career and Amenadiel has a new love interest.
With the Sinnerman in custody, Lucifer is prepared to go to any length to get his devil face back. But, with another victim's life on the line, will Lucifer's conscience hinder or help? Meanwhile, Trixie is introduced to Charlotte and questions the relationship she has with her father.
In a flashback episode that takes place when Lucifer first came to LA, Amenadiel comes to retrieve his fallen brother, but is shocked when he is mugged. Amenadiel enlists Lucifer's help to track down the mugger and Lucifer, in turn, offers his assistance - but only in exchange for a favor. Meanwhile, Chloe and Dan - who are still married - investigate the murder of an MMA fighter, Aidan Scott, at the hands of the same killer who mugged Amenadiel.