Police Inspector Thomas Pitt and his wife Charlotte investigate the death of a judge from opium poisoning.

Police Supervisor Thomas Pitt and his wife Charlotte investigate a serious of gruesome beheadings in Hyde Park.

Charlotte Ellison Pitt, a proper upper class young woman, and her husband, a police inspector, solve an unpleasant and baffling crime.

Charlotte, the wife of a police inspector, becomes interested in one of her husband's cases and begins her own investigation.

Inspector Thomas Pitt and his wife Charlotte join forces to find the killer of Charlotte's brother-in-law.

When William Weems, obscure moneylender, is murdered Ispector Pitt is asked to investigate and discovers Weems was a vicious blackmailer who had a list of some of London's most distinguished gentlemen in his office.