Max Caulfield, photographer-in-residence at the prestigious Caledon University, discovers her closest new friend, Safi, dead in the snow. Murdered. To save her, Max tries to Rewind time – a power she's not used in years… instead, Max opens the way to a parallel timeline where Safi is still alive, and still in danger! Max realizes the killer will soon strike again – in both versions of reality. With her new power to Shift between two timelines – can Max solve and prevent the same murder?