In Seven, two detectives track down a serial killer who kills people that violate the seven deadly sins. They don’t know the serial killer’s name so he goes by John Doe. John Doe is always miles ahead of the detectives. Even when they catch him, they’re only falling into his devious scheme to finalize the last sin. In the end, once he opens the box, Doe forces Mills to make a choice: kill him or let him go.