One rainy night, the unthinkable happens: Dylan Moran's car plunges off the road into a raging river, his beautiful wife drowning as he struggles to shore. In the aftermath, through his grief, Dylan experiences sudden, strange visions: wherever he goes, he's haunted by glimpses of himself. Dylan initially chalks it up to trauma, but that changes when he runs into a psychiatrist who claims he's her patient. She says he has been undergoing a unique hypnotherapy treatment built on the idea that with every choice, he creates an infinite number of parallel universes.