Having dealt with the imperial battle-blimps, Agony and Salami reach the Caribbean island of Montserrat and question the villagers while undercover as ordinary sexy travelers. After hearing tales of strange goings-on at an observatory, the SBWs ascend the slopes of a volcano and face-off with hundreds of rogue automatons, the mysterious Flavius Dio, and the mustachioed Septimus Foul himself.