A kilometer beneath the surface, in the cold, dark ocean depths, world renowned exo-biologist Samantha Price and ex-lover Mike Leigh, pilot of a deep-sea submersible, come face to face with the Mimetai, a creature that knows nothing of humanity.

Hurled to the sea bottom, their submersible incapacitated by the Mimetai and with air running out, Samantha and Mike rekindle their love and by doing so, give themselves an unexpected chance at happiness and maybe even survival.