One night while walking home on the streets of Chicago, Jason Dessen — a physicist, professor, and family man — is abducted into an alternate version of his life. Wonder quickly turns to nightmare when he tries to return to his reality amid the multiverse of lives he could have lived. In this labyrinth of mind-bending realities, he embarks on a harrowing journey to get back to his true family and save them from the most terrifying, unbeatable foe imaginable: himself..