Murderers, Poppies and Mince Pies. Young gardener Mags Blake is asked for help by historian Sam Hawthorn. He is working on a Festschrift about the monastic island of St. Michael's Mount, and Mags is to write a chapter about the island's gardens. During her research, she comes across the naked body of an old man in a chapel - no one seems to know him. When a friend of Mags falls under suspicion, she and Sam get involved in the investigation. In the process, they stumble upon a decades-old secret. And between the two it crackles violently ...