After getting in a car accident with his wife and teenage son, Detective Michael Britten finds himself alternating between two different realities. One minute he is navigating a world where his son survived but his wife perished and the next he is in another reality in which his wife is the one that survived. In order to keep both loved ones alive, Britten begins living in dueling realities. To try to regain some normalcy in his life, the detective returns to solving crimes in both worlds, with a different partner in each.