When copywriter Victor Dean falls to his death on the stairs of Pym's Advertising Agency, everyone assumes it was an unfortunate accident. His replacement doesn't think so and begins asking a lot of questions. The new man is something of a mystery to his colleagues, and he certainly dresses well considering his meagre writer's salary.

Of course the new copywriter is none other than Lord Peter Wimsey, working incognito to uncover the truth behind what is certainly murder. In between writing catchy slogans, Wimsey sets out to catch the murderer and finds a network of blackmailers, drug pushers, and killers.

But the deeper he gets into this criminal underworld, the more his own life is in danger. And as the murders increase, he must work to a tight deadline if he is to solve the case before it's too late.