The prologue opens with Ethan Mars, spending his life with his family. He later loses track of one of his sons, Jason, at a busy mall. Jason is soon found, outside on the street, and Ethan jumps to try to save him from an oncoming car. Jason is killed, while Ethan is injured and falls into a coma for six months. Two years after the accident, Ethan is suffering from depression, a fear of crowds, and blackouts that last for several hours. He is estranged from his wife, and his remaining son, Shaun, is distant with him. While at a park with Shaun, Ethan has another blackout, and wakes to find Shaun missing.