Drury Lane 1844. A robbery has been committed at a pawnbrokers leaving three people dead. The man called in to investigate is Pyke head of the Metropolitan Polices newly formed Detective Branch at Scotland Yard. Pyke must find the culprit & quickly especially as the identity of one of the victims threatens to expose his own criminal past. A valuable religious artefact appears to have motivated the robbery but when the main suspect commits suicide in police custody the investigation falters. Then the rector of a wealthy parish is brutally murdered & Pyke spots a connection. His suspicions lead him to a dissolute former Catholic priest rumours of devil worship & an old case that no one wants him to investigate. With time running out & the murderer threatening to kill again Pyke must face up to forces within the police & the church who would prefer the secrets of the past to remain buried for ever.. .