Orphaned at an early age, Philip (Claflin) was raised solely by his cousin, Ambrose. When Ambrose dies abroad on the eve of Philip’s 25th birthday, Philip - after a series of letters sent to him by his cousin prior to death - is convinced Ambrose’s mysterious wife Rachel (Weisz) is to blame. When she shows up at his Cornwall home, his rage quickly turns to obsession as he becomes infatuated with her. But what is she really after?