England, May 1945. In the last days of World War II, Monkshill Park School for Girls stands far apart from the violence in Europe. Yet a woman has been murdered in its grounds. Annabel Warnock, a teacher with a secretive past, has disappeared. The teachers and girls whisper that she's run away, but in fact she has met a violent end. Replacement tutor and amateur crime writer Alec Shaw arrives to find a school riven with bitter rivalries and dangerous tensions. He begins to suspect there is a real-life mystery waiting to be solved… and these echoing halls hide a killer.