Mr. Keen is an enigmatic older man who promises to find anyone, anywhere. No find, no fee - and the fee is scaled appropriately based on the task and the client. He's aided in his task by a shadowy network of talented experts and a legion of attractive young typists. In the five interlinked stories of The Tracer of Lost Persons, the actual business of tracing goes on in the background. When Mr. Keen is introduced to each of the five protagonists, he does so in a curt, businesslike way - generally with a bit of showing off....