Disorientated, drenched, and on the verge of a fever, George Lassiter wanders the streets of London until attracted to a particular house which he breaks into in order to warm himself by the fire. While he is waiting in the darkness and warmth, three people enter, one of them apparently drops dead on the spot, and Lassiter beats a hasty retreat before being caught by a local bobby. Upon telling his story, the house is investigated and no sign of a body is found, so Lassiter is carted away to the local hospital. And when Lassiter’s friend, part-time sleuth and general man-about-town Jack Haldean, hears of his predicament, it’s the beginning of a complex and dangerous skein.