Lucifer is the charming, charismatic and handsome-as-hell original fallen angel, who, bored and unhappy in Hell, takes refuge in Los Angeles, where he uses his gift of persuasion to punish bad guys. But the longer he's away from the underworld, the greater the threat that the worst of humanity could escape.
Lucifer is distracted by his mother’s escape from hell, as he and Chloe investigate the murder of a stand-in actress. Meanwhile, Chloe’s faith in Lucifer is tested by the new medical examiner, Ella. Also, Amenadiel hopes to rein in Lucifer’s wild side, as they both deal with the absence of Maze.
When Lucifer’s mother, Charlotte, turns up at the scene of a grizzly murder pleading innocence, Lucifer is hesitant to believe her tale. Not wanting to leave her on her own, he instructs Maze to babysit her – and not to torture her, allowing him to investigate the case with Chloe.
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.
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.
Lucifer is excited to investigate the murder of his favorite action movie hero, Wesley Cabot. Longtime rival Rolf Van Zandt initially is a suspect, but the investigation soon shifts. Meanwhile, Uriel shows up and Amenadiel is forced to come clean about his lost powers. Also, Lucifer and Uriel fight about Chloe and their mother.
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.
When the prisoner convicted of killing Chloe's father is murdered, new evidence suggests he was actually framed. Meanwhile, Maze tries to find a job and Lucifer shadows Dan in order to learn how to be "normal".
After discovering that Azrael’s blade has been stolen by a human, Lucifer quickly connects it with a string of violent stabbings revolving around a local yoga studio. While Chloe investigates the murders, Lucifer enlists Ella’s help in locating the sword to stop the carnage.
Following the murder of the owner of the building in which Lux is located, Lucifer and Chloe search for the killer, while Lucifer also deals with the fact that the new owner wants to evict him and demolish the place. Lucifer goes to great lengths to protect his home, and is entirely shocked when Chloe is supportive of him. Meanwhile, Maze and Amenadiel follow Charlotte around, as she comes up with a plan to upset Lucifer enough to want to leave earth and go back to Heaven.
Charlotte is determined to get Lucifer to leave Earth by turning Chloe against him. Meanwhile, Amenadiel has begun working as Charlotte's soldier, which makes Maze question his loyalty.
After Lucifer and Chloe have an interrupted "moment," the tension between the two of them makes it difficult to investigate the murder of two victims, who happen to be Lucifer's ex-flames. Since Lucifer seems to be the only connection, interviews are conducted with his recent paramours and a surprising connection is made that helps lead them to the killer. Meanwhile, Charlotte continues to try and manipulate Chloe and Lucifer's impending romance and a larger threat is revealed.
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 must find the antidote to the Professor's poison before it kills Chloe. He travels to hell to find the Professor's soul and get him to turn over the antidote. While he's there, he is forced to confront his guilt about Uriel's death. Mom heads to hell to get Lucifer back, but Lucifer still feels betrayed by his parents because of something he discovers.
Two weeks after Chloe’s near death, Lucifer has gone off the grid, cutting off all contact from his family and the police department. He materializes just in time to help solve an up-and-coming guitarist’s murder and introduces the department to a ditzy stripper named Candy, a mysterious new woman in his life. While Lucifer’s mom desperately tries to contact her son, Chloe tries to push him away. Lucifer must find a way to prove himself in order to be invited back onto the team.
When it is discovered that the flaming sword is the only hope for the family returning home safely, the pressure is on for Lucifer to control what he has never been able to control before – his emotions – in order to ignite it. Meanwhile, Chloe wants to air some emotions of her own, but when a therapist and head of admissions at a prestigious private school turns up dead, the team must get to the bottom of it.
When a grisly murder takes place at an insane asylum, the prime suspect calls himself God. After realizing that this man could actually be his father, Lucifer struggles with his feelings towards him and tries to find the truth, all while trying to discover who the real killer is.
When the man who had the final piece of the Flaming Sword is murdered and the piece goes missing, Mom joins Chloe and Lucifer on the case to track down the killer. But when Lucifer gets sidelined, Maze recruits him to help save Dr. Linda's endangered career and confronts him about the secrets he's been keeping.
After Charlotte accidentally charbroils a man to death in self-defense, Lucifer must try and keep Chloe from figuring out the truth. Lucifer puts Maze in charge of finding Charlotte and Amenadiel, who have both gone missing in light of recent circumstances, while he finds a permanent solution for the ticking-time-bomb he calls Mom.
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.
Upon leaving hell, Lucifer Morningstar retreats to Los Angeles for a more exciting life. When the murder of a friend connects him with LAPD detective Chloe Decker, Lucifer becomes intrigued with the idea of punishing criminals, sending the devil himself into a struggle between good and evil.
When a movie star's son is killed after being chased by the paparazzi, Chloe takes a deep look into the case with a little help from Lucifer. Meanwhile, Maze and Amenadiel continue to encourage Lucifer to go back to hell.
When a 22-year-old future superstar quarterback wakes up to find a dead girl floating in his swimming pool, he turns to his friend, Lucifer, for help. Lucifer enlists Chloe to investigate the case, which leads to the world of big money sports and people who will literally kill to be number one.
In an effort to get over his infatuation with Chloe, Lucifer decides that he must seduce her. Meanwhile the two team up on a missing girl case and Amenadiel confronts Maze about his concerns about Lucifer.
After a shooting occurs at a fashion show and a young woman is killed, Lucifer becomes intrigued by the danger of the situation and begs Chloe to get in on the case. Meanwhile, when Maze admits to Amenadiel that she wants to go back to hell, he sets his sights on Dr. Linda.
Lucifer bails on Chloe when he becomes bored with her investigation into a ruthless biker gang murder. However, when he discovers something was stolen during the crime that was very personal to him, he demands that Chloe let him rejoin the case.
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.
When a therapist is murdered, Lucifer and Chloe enlist the help of Dr. Linda to look into possible suspects. Meanwhile, Malcolm confronts Chloe about the night he was shot, and Lucifer experiences his first bout of jealousy.
A priest seeks out Lucifer's help when he suspects an underground drug operation has set up shop at a neighborhood youth center. Meanwhile, Malcolm manipulates a way to keep an eye on Dan.
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.
When philanthropist Tim Dunlear is found dead, Lucifer explores his good side by becoming a benefactor for Tim's glitzy Los Angeles charity.
When a woman is found dead on the Hollywood Walk of Fame – with her body twisted into the shape of a pentagram – the investigation leads Lucifer and team into the world of Satanists, where they soon realize, evil doesn't always live where we expect it to.