After a woman is found dead on the same beach where his wife died 27 years earlier, Ludovic Béguin stumbles upon a space-time rift with unimaginable consequences.

Ludo uncovers a link between Mélanie and Zoé's cases; he learns that his actions in virtual reality carry implications for the present.

In the past, Mélanie takes matters into her own hands; forced to step back from the case, Ludo goes home to a nightmare.

A change in command raises new questions; as Agathe begins to suspect his motives, Ludo realizes the killer may be closer than he thought, much closer.

Ludo's revelation sends Mélanie reeling; outmaneuvered, Ludo races to fulfill her dying wish, meeting Juliette.

With 90 minutes to spare, Ludo and Mélanie try to outrun fate in their respective timelines.