Carter Brooks expects an ordinary birthday celebration until a masked assailant corners him in a corporate restroom stall and ends his life with a single gunshot. Instead of permanent darkness, Carter snaps awake on his living room couch hours earlier, initially dismissing the horrifying encounter as a vivid nightmare. When successive lethal ambushes—including a catastrophic vehicular collision—replay with chilling precision, Carter realizes he is trapped within an unrelenting temporal loop that resets upon each death.
Weaponizing his accumulated memories across endless resets, Carter investigates his coworkers, intercepting phone records and unmasking the hired assassin during a planned blackout. Just when he believes he has solved the homicide, he uncovers a second operative coordinating the vehicular hits, alongside a sinister corporate conspiracy to liquidate company shares. Carter must outthink two ruthless killers simultaneously to break the temporal curse and keep his colleagues alive before midnight strikes.
