In order to save Paris from an international bloodbath, a grieving scientist is forced to face her tragic past when a giant shark appears in the Seine.

Three years after the Paris triathlon disaster, the center of the Capital is submerged, Sophia and Adil reunite for a high-risk mission: to track Lilith, the original predator, in the shark-infested Seine. There, they will discover that the deadly wildlife hides a much more surprising reality...