Hadley Jamison doesn't know what to think when she hears that her classmate, Archer Morales, committed suicide. She didn't exactly know him, but that doesn't stop her from feeling like there was something she could have done to help him. So to Hadley's surprise, on the very night of Archer's funeral, she has a run in with Death himself and is offered the chance to go back in time to stop Archer from ending his life. The catch? She only has twenty-seven days to do it. And if Hadley doesn't succeed? Well, she doesn't want to think about that.

Max Caulfield has had a strange few months. She discovered she had time rewind powers, solved the disappearance of a missing teenage girl, and saved her best friend Chloe Price, and her town Arcadia Bay from a storm. Max quit using her powers, but she starts having visions of a familiar, fierce girl, that's supposed to be dead- Rachel Amber. Chloe and Max try to make sense of the visions, and find out the true story about what really happened to Rachel.