The Librarians head to Paris after a string of robberies leaves mysteriously lovestruck victims in their wake. When they learn that a magical love artifact is behind the thefts, they enlist help from Vikram's old friend — Cupid himself. 

When the magic door reroutes Charlie, Lysa, and Connor to a bizarre manor where a series of Agatha Christie-style murders take place, they must figure out whodunnit while Vikram tries to track them down with the help of a mysterious tarot card reader.