British PI Joe Sixsmith needs some help to resolve a dispute with his insurance company, so he turns to Luton, England's most prominent law firm. But he winds up storming out, infuriated at the rude treatment he receives-which presents a problem once the firm's partners start getting murdered soon afterward. And as he tries to fend off the police who suspect him, he's still got his own cases to juggle, including a plot against a female track star...