With Mam confined to bed, the boys must look after her and themselves.
Fagin is being tormented by his old adversary, the baboon Loping Ted. Meanwhile, Mam cannot sleep, and decides to call in to a late night radio programme in the hope that the host, Chris Desire, can cheer her up.
A discontented Hoffman and Charlie decide to take up an offer of work from Mr Shepherd, only to be caught by Sgt Ball and Claude. The work is not exactly what the boys expected, however, especially when they find out that they have to work on the day of the local rock festival.
The Immigration Department, in the guise of Adam Mosley, plan to deport Muktar Rahman, the elderly patriarch of the local Indian restaurant, back to the Punjab. The community rallies around to save him, led by Mam.
Newly-seconded WPC Holly Nash provides unexpected romance for Claude, as Sgt Ball is set up by arch-enemy DI Frank Blunt of Internal Affairs. Fagin and Mam warn Ball, but is he being dangerously blase? Hoffman and Charlie get tooled up, but disaster seems inevitable.
Mam and Fagin are concerned when Sgt Ball asks the boys to go to Cardiff for him and pick up an envelope from a Mr Hunter. They warn the boys to keep a low profile, as the city is a dangerous place. Will the pair be able to heed Mam and Fagin's advice and return home safely?