When Angela (Charles's ex-wife) is arrested in a drugs bust, Henry and Charles embark on a novel scheme to raise money for her defence lawyer. The ever vigilant (and vindictive) PC Burns quickly smells something funny, and goes undercover in an attempt to catch them in an illegal act. When the scheme starts to rapidly unravel, it's Margaret (intentionally) and Cath, along with her new lodger, Amaya (very unintentionally) who save the day.