Ash tackles a bomb that is not considered vital with a new fuse extractor that doesn't work properly. New Lieutenant Machin is placed with Ash to get some on-the-job training. Major Francis criticises Ash after a patriotic magazine article profiles 347 Section.

Ash and Machin are recalled to London from a bomb disposal course and attend to a bomb in a school yard that is dangerously close to a telephone exchange. When another bomb is uncovered close by, Ash reluctantly allows Machin to defuse the his first bomb.