Whitey Action is daughter of Ben Benson, the New Yorker Chief of the London police. When the Queen is killed by a gang of mutants, known as The Freebies, Whitey guesses they are behind the murder while her father's forces focus their attentions on a single 'a mutant insurgent' suspect. Terry Phoo, a highly trained combat cop from the Hong Kong JKD police force is called in by Benson's superior, Lord Rothwell, as he is supposedly an expert at fighting mutants. However, his investigative skills leave much to be desired. 
The Freebies are castigated by a mysterious group of sinister characters known as the Star Chamber for killing the Queen as they were supposed to mutate her not murder her. The Star Chamber give the Freebies one last chance, demanding that William is mutated before he is crowned. While at a party in the Freebies nightclub, Whitey sees Princes William and Harry being led off by the Freebies, and she causes a big scene, preventing them from being captured but getting herself arrested by Terry Phoo. Convincing him that she is a special agent, he takes her to his hotel room, where, while looking for chocolate, she finds a case containing 'the Buddha's loincloth that transforms into a pair of hotpants, which she immediately tries on. Phoo is rather shocked by this, especially when she pulls a giant chocolate egg out of them and the legend of a 'Chosen One' who is destined to use their power is revealed. Whitey can pull anything she desires from the pants and Terry decides this means that she is the Chosen One.
Together Phoo and Action save the Princes from the evil plot to mutate them, and the subsequent plot to set the lead mutant, Jimmy Freebie, on the throne. The story ends, however, with William beginning to mutate as he is crowned, the Star Chamber seem to have won this battle despite the Freebies bungling and Phoo Action's best efforts.