Full Dark House by Christopher Fowler
Edgy, suspenseful, and darkly comic, here is the first novel in a riveting new mystery series starring two cranky but brilliant old detectives whose lifelong friendship was forged solving crimes for the London Police Department's Peculiar Crimes Unit. In Full Dark House, Christopher Fowler tells the story of both their first and last case—and how along the way the unlikely pair of crime fighters changed the face of detection.