Sherborne in 1436 was a quarrelsome town, the townspeople and the Abbot at loggerheads over the narrowing of the entrance to Allhallows, the chapel-of-ease attached to the Abbey, and the positioning of a font in the same chapel. Against this background, a young man is found murdered in the Lady Chapel of the Abbey, and subsequent strange deaths occur. Matthias Barton feels compelled to investigate and being unused to murder, stumbles along until suddenly things become clearer to him.