The sudden death of his mother made Mark (Elijah Wood) a poor child who was left unattended. His father, who had been busy with work, fostered Mark in the home of Uncle Wallace (Daniel Hugh Kelly). As a result, Uncle Wallace's son Henry (Macaulay Culkin) became Mark's best friend. Henry was a good boy in everyone's eyes, but as time went by, the smart and sensitive Mark discovered Henry's dark and evil heart. What shocked Mark was that Henry actually tried to murder his sister Connie (Quinn Culkin) and mother Susan (Wendy Crewson). Mark wanted to reveal Henry's true face, but no one believed him. Instead, they regarded him as a bad boy. In anxiety, Mark decided to personally take action to destroy Henry's plan.