Nine tales of detection open with the title novella, the longest piece in the gathering and the only one running to a sustained length. In it, a young couple welcome their first lodgers to a remote country guesthouse just as a heavy snowfall seals the house off from the outside world. Word arrives that a killer is at large, whistling an old nursery rhyme as a signature, and the trapped party realizes one among them may be next. The remaining eight stories are shorter and self-contained, drawing on the casebooks of the author's most familiar investigators. Several feature an elderly village spinster whose grasp of human nature lets her read a crime through gossip and parallels to ordinary parish life. Others follow a fastidious Belgian detective who reasons his way through a vanished child, a poisoning, and a curious household. A final entry turns to a more enigmatic figure whose appearances coincide with matters of love and old wrongs. Across the set the construction stays compact and clue-driven, each puzzle laid out for the reader to weigh before the solution lands. Settings range from country houses and quiet villages to London flats, with motive and disguise recurring throughout. Assembled for American readers in 1950, the volume collects work that first appeared in magazines over the preceding decades, pairing a longer suspense piece with a sampler of short detective fiction. The collection rewards readers who enjoy fair-play deduction and the steady unwinding of a hidden scheme.