A widow's sudden suicide sparks rumors that she murdered her first husband, was being blackmailed, and was carrying on a secret affair with the wealthy Roger Ackroyd. The following evening, Ackroyd is murdered in his locked study, but not before receiving a letter identifying the widow's blackmailer. Kings Abbot is crawling with suspects and it's up to famous detective, Hercule Poirot, to solve the case.

Jack Argyle has died in prison, wrongly accused of the murder of his adoptive mother Rachel, and now everyone in the Argyle family looks suspicious.

The personal ad posed a simple question: Are you happy? If not, consult Mr. Parker Pyne. The answer is a resounding no for a jealous wife who suspects her husband of infidelity...for a lonely widow driven to assume a new identity...for a distraught mother whose son has been kidnapped...and for the fiancé of a strangely reclusive bride-to-be. But what sort of detective would solicit in the personals? The sort who has a knack for investigating affairs...

Sherlock Holmes and Dr. Watson investigate the reappearance of a seemingly supernatural hound, bent on destroying the House of the Baskervilles in accordance with an ancient curse.

An actress is involved in a murder mystery.