Pharmacist James Elliot is a troubled man. His marriage to wife Amy is under strain, and every night his sleep is broken by dark, disturbing visions. As his dreams grow progressively more violent and James begins to fear for his sanity, he turns in despair to Dr. Charles Davies, a colleague and psychiatrist. As he beings to delve into Elliot's subconscious Davies realises that he has seen these symptoms before, but even his many years of experience could never prepare him for the terrifying truth . . .