The series follows Jason Dessen, a physicist, professor, and family man who - one night while walking home on the streets of Chicago - is abducted into an alternate version of his life. Wonder quickly turns to nightmare when he tries to return to his reality amid the mind-bending landscape of lives he could have lived. In this labyrinth of 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.