Holy Disorders takes Fen to the town of Tolnbridge, where he is happily bounding around with a butterfly net until the cathedral organist is murdered, giving Fen the chance to play sleuth. The man didn’t have an enemy in the world, and even his music was inoffensive: Could he have fallen afoul of a nest of German spies or of the local coven of witches, ominously rumored to have been practicing since the 17th century?