In a remote hotel in Normandy, bio-mathematician Danielle Flinders (Alicia Vikander) meets James More (James McAvoy). There to prepare for their respective missions, bio-mathematician Danielle and British Secret Service Operative James, did not expect to meet the love of their lives the retreat.

After days of intense passion, they must separate. Danielle embarks on a deep-sea diving project to support her theory about the origin of life on our planet, while James journeys to Somalia to track down a source for suicide bombers infiltrating Europe. Soon, they are worlds apart. James is taken hostage by Jihadist fighters and has no way of contacting Danny, and she has to go down to the bottom of the ocean in her submersible, not even knowing if James is still alive.