The lads return to camp to find that much has changed in their absence, Upshot-Bagley worries about his pig while her carer is in the glasshouse, and Bullimore blocks a plan to extract trade secrets from Catchpole.
The lads get into trouble when when they're caught gambling in a café, a talk from the League of Light helps Catchpole see the error of his ways, and not everyone's taken in by a plan for hut 29 to clean up their act.
Bullimore makes accusations of petty thievery when blankets go missing, a field marshal's baton arrives ahead of a speech on camp morale, and Flogger has to hide the evidence after proving his safe-cracking ability.
Bullimore's furious when a journalist causes a cancellation of charges, Flogger attempts to make money by insuring the lads against jankers, and Catchpole tries to get himself into trouble after smelling a rat.
Comments in a book persuade Upshot-Bagley to give up pigs and whisky, hopes of weekend passes are dashed by changes in camp discipline, and a guilt-ridden change of heart brings the threat of being bowler-hatted.
The lads think a dropped parcel must be to do with Catchpole's birthday, Bullimore's not happy when a musical watch from Australia gets lost in the post, and Len hits on the bright idea of having the tune changed.
The lads get revenge on Bullimore by nominating him for a competition, Moosh's mental health is questioned when he finds a man under his bed, and Upshot-Bagley uses press interest to help with a recruitment drive.
Flogger's furious when a fracas gets in the way of his new betting system, an art course provides opportunity for one man to travel to Itchwick, and Bullimore insists that Catchpole do his portrait to prove his artistic skill.