The day after celebrating his son Jason's tenth birthday, Ethan Mars and his family go shopping. Jason and Ethan are hit by a car; Jason dies, and Ethan falls into a six-month coma. After he wakes from the coma, Ethan, blaming himself for Jason's death, divorces his wife Grace and moves into a small suburban house while experiencing mental trauma and blackouts. Two years later, while at the park with his other son Shaun, Ethan blacks out. When he wakes up, he discovers that Shaun has been kidnapped by the "Origami Killer", a serial killer whose modus operandi consists of abducting young boys during the fall season, drowning them in rainwater, and leaving an orchid on their chests and an origami figure nearby. Norman Jayden an FBI profiler struggling with addiction to a drug called Triptocaine, investigates the death of another Origami victim and concludes that he died the same day as a violent rainstorm, which flooded the cell where he was kept. Based on weather patterns, he estimates that Shaun has only three days to live.
