A Fall from Grace — Brian Clegg

When a body is found in Bath Abbey, fallen mysteriously through the East window, vicar Stephen Capel and his girlfriend, Detective Constable Denning, are drawn into a strange treasure hunt that has deadly consequences.Starting with a page torn from a seventeenth century book, they must track down the original folio and an ancient key to stop the killers of Charlie Smith before they can uncover the mystery. But the case takes a strange turn when the book proves to be a fake.A cosy West Country murder mystery.