He is jolted out of his stupor when his remaining son son, Shaun, is suddenly kidnapped by the "Origami Killer," a notorious serial killer who uses rising rainwater to drown his young victims, then leaves origami figures on the bodies. If Ethan wishes to save his son from a similar fate, he must complete the trials set by the Origami Killer, who wishes to test just how far Ethan will go to save his child.