The lamplighter : a novel
(Book)

When 19th century Edinburgh is horrified by a series of brutal murders, a young woman claims to have dreamed each crime in detail and blames them on a lamplighter who may or may not be real. The official investigation headed by police inspector Carus Groves; the unofficial one, by professor of logic and metaphysics, Thomas McKnight, and his assistant, Joseph Canavan, gravedigger.