Henrietta Tobias returns from missionary work in Africa to regain her strength in the tranquillity of an English village. Yet she quickly finds beneath its respectable façade a den of iniquity. And nowhere more so than at the convent on the hill. Alerted by a series of exuberant noises, she looks over its garden wall to see a naked male bottom bouncing above a shapely young nun. With God's wrath rising inside her, she sets out to discover its blasphemous owner. And in doing so, puts herself in mortal danger.