Wychwood-under-Ashe is a small village with a reputation for witchcraft and folklore.

Retired policeman Luke Fitzwilliam meets one of its residents on a train. She tells him that someone is killing off the residents one by one and she is on her way to tell Scotland Yard about it. However before she can do so she is killed by a hit and run driver.

A stay in the village provides Luke with a bewildering cast of suspects but with the help of Superintendent Battle the killer is finally unmasked.