Troubles mount at DIPJ Lille. Morgane fails her exam, Karadec's linked to her mother-in-law's death, and Céline's son faces murder charges. Removed from the case, she arranges a Murder Party to prove his innocence.

During her police exam, Morgane ditches protocol to share her last case with Karadec. Past memories blend with investigation details as she races to save him, her future in law enforcement hanging in balance.