Detectives Mitchell Morse and Dreyfus Trier chase a serial killer in a beach town. When a severed foot washes ashore they discover that the DNA matches Dreyfus’, who has both of his feet. During their investigation, Mitchell’s wife Emily is murdered because of Dreyfus’ carelessness. Mitchell becomes more obsessed with revenge than justice. Mitchell lures Dreyfus to a lighthouse, where he overpowers his partner, breaking Dreyfus’ ankle. The light washes over them…and they go back in time. Mitchell tries to revise Emily’s murder, but the number of times he’s had to relive it has driven him mad. He alienates his wife and pushes her closer to Dreyfus.