Dave van Dam is a typical high school student who dreams of becoming a Time Patrolman — until a mobster from the 1920s brings him a message: "Don't join the Time Patrol, or else!" Dave soon finds the secret of time travel has been stolen by the most famous mobster of all, Al Capone. If Dave and his friends don't act fast, Capone will be running a criminal empire through all time. But in an age filled with machine guns and murder, only criminals can fight criminals. So Dave travels up and down the timeline to stop Capone himself — as the mastermind gangster White Ribbon Dave!