A Pocket Full of Rye — Agatha Christie

The shocking thing about Rex Fortescue's murder was that the contemptible tycoon wasn't knocked off sooner. But when two less-deserving souls fall victim to the killer, Miss Jane Marple is engaged to detect. The only link appears to be buried in a not-so-innocent verse. So what's the rhyme and reason behind the playful hint? The answer draws the shrewd sleuth into the heart of a family secret--and an increasingly menacing game that's anything but child's play.