It was a lovely hot summer afternoon and old Mrs. Lavant had retired as usual in the hammock in her garden for her customary after-luncheon nap. There her great-niece Annabel finds her when she calls with a friend David Wiston, but to her horror the old lady appears to be dead, a fact which David, a budding doctor, duly confirms. Yet within an hour the corpse is sitting up and taking notice. When is a corpse not a corpse?

That is the question for you to answer, with the accomplished assistance of Inspector Arnold of Scotland Yard and his friend Desmond Merrion.