The Boy Detectives' Club arrives at the Space Expo. Hanasaki and Kobayashi board the shuttle for the craft in the sky that Twenty Faces uses as his base, where Akechi is being held captive, but the shuttle is blown up and the two of them are held in place by security robots. Inoue and the others face off against the special security force, but they're at a disadvantage. Just when they thought all hope was lost, Ohtomo drills his way up from the ground in a vehicle being used as a Space Expo exhibit, but their relief is short-lived...