Someone is posing as Lupin and blowing up bridges, causing a lot of damage and injuries. Lupin and Jigen discover that the bomber is trying to force an armored car to travel along a route of his choosing. They track down the bomber, but he forces Lupin and Jigen to attempt to rob the armored car. He threatens to kill a girl he kidnapped named Lisa unless Lupin and Jigen perform the job.
