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.

A killer that Marcus helped put away in the 1950s has apparently returned, killing cheating couples, and Marcus insists on helping Chloe solve the new murders. Meanwhile, Dan grows tired of Maze's antics around Trixie, and Charlotte demands the truth from Amenadiel about her missing memories.