Under Paris

The scientist Sophia Assalas is researching the shark Lilith, a.k.a. Beacon Seven, in the Great Pacific garbage patch with her partner Jade on board and her team of four-men divers, including her husband Chris. When they see Lilith, Chris notes that the shark has grown more than the usual and he tries to take a blood sample for the research. However, Lilith attacks the divers, slaughters them and flees from Sophia. Three years later, the traumatized Sophia is working at an aquarium when the twenty-year-old activist Mika, who works with a group of environmentalists, brings Sophia to her base and her colleague Ben shows the beacon of Lilith trapped in the Seine. Mika searches for Lilith but is arrested by the River Police under the command of Sgt. Adil. She calls Sophia but the police officers are reluctant to believe that there is a shark in the Seine. But when a dead man is found with shark bites, Adil believes in Sophia and team-up with her. They ask the Mayor of Paris to call off the triathlon that will happen in the Seine in a couple of days, but the politician refuses and a tragedy happens in Paris.