Part One - A Pound of Flesh: The relief find themselves short-staffed with Boyden having taken leave. Singh investigates several assault cases, which he believes are down to a moneylender getting heavy handed when calling in a debt. Ackland sees the mother of one of the victims talking to Amy, Boyden's daughter, and it turns out she is also in debt to the loan shark. When Amy is arrested for petty theft, Ackland convinces Boyden to talk to her, and when Amy is assaulted by the loan shark's thugs, Boyden resolves to pay off her debt himself. When he turns up with the money, he is recognised by one of the men as a police officer, blows a CID raid on the office and Amy finds herself in grave danger.