A group of men go to great lengths to break into a warehouse at a loading dock in London - just to steal a crate of fish soup. The authorities don't know what to make of it and pass the case on to the Department.
Soon the case seems almost closed when Stewart and Annabelle find the crate, discarded, cans of fish soup and all. But then why was it stolen in the first place? Obviously someone made a mistake... Jason thinks something is foul and heads to Portugal, where the soup crate originated from. Working the case from both ends, the agents get on the trail of international smugglers, and get caught in the middle of a dangerous game of double-cross among thieves...