Kat and Borja appear to be a perfect couple, but as in every marriage they keep secrets, lies and infidelities that will come to light the night an unexpected visitor arrives.

Lewis (Luke Evans) is an outwardly ordinary guy, but in reality he is hiding an obsession – revenge – against Cathy (Kelly Reilly). Lewis kidnaps Cathy in broad daylight and takes her to his home, where he locks her in a soundproof cell and attempt to extract a dark secret from her past.