Samantha Kingston (Zoey Deutch) seems to have it all: popularity, a loving boyfriend (Kian Lawley) and a seemingly perfect future. Everything changes in the blink of an eye when she dies in a car crash but then magically wakes up to find herself reliving the same day over and over again. As Samantha tries to untangle the mystery of a life derailed, she must also unravel the secrets of the people closest to her and discover how the power of a single day can make a difference.