Ella's older brother Jay is the primary suspect in the murder of a diamond dealer, and she sets out to prove his innocence. Meanwhile, Marcus tracks down Amenadiel and wants revenge for Amenadiel putting the Mark on him and condemning Marcus to immortality.

Lucifer comes up with a way to undo the mark placed on Marcus, but things don't go quite as planned. Meanwhile, Chloe and Dan try to solve the attempted murder of the assistant to a Hollywood producer, Maze goes head-to-head with Amenadiel, and Charlotte goes into therapy with Linda.