When a massive power outage plunges the city of Detroit into total darkness, a disparate group of individuals find themselves alone. The entire city's population has vanished into thin air, leaving behind heaps of empty clothing, abandoned cars and lengthening shadows. Soon the daylight begins to disappear completely, and as the survivors gather in an abandoned tavern, they realize the darkness is out to get them, and only their rapidly diminishing light sources can keep them safe.

Sam Reide has the ability of traveling to the past and works to the police department solving unresolved crimes, witnessing the events with the support of his sister Jenna Reide and reporting the criminal's identity to Detective Dan Glenn. When Elizabeth Brown that is the sister of his former girlfriend Rebecca Brown that was murdered a couple of years ago pays a visit to him, she tells that she has just found Rebecca's journal with evidences that Lonnie Flennons, who was accused for the murder, is innocent. Sam decides to witness the murder of Rebecca and his interference affects the future. He travels to the past other times trying to fix his mistakes, but every time he returns, the future is in worse condition.