The Invisible Worm

Roses are dying at Stagford Lodge Preparatory School, and classics master Richard Oakley calls upon the two gardeners to help restore the flower beds. On the last day of term, the mysterious ritual involving a member of staff dressed as a Stag turns sour when Simon Todd, the geography master, is found dead in the undergrowth, killed by a harpoon from the headteacher's prized harpoon gun. Rosemary and Laura must weed out the killer from the school's sinister staff before it is too late.