Tommy and Tuppence Beresford visit the Sunny Ridge Rest Home, where an old rambling woman insists that something is buried in the fireplace in the sitting room, and that a painting of a secluded house is strangely familiar. When the woman disappears without a trace, the sleuths discover something wicked at Sunny Ridge.

Tommy and Tuppence Beresford have just become the proud owners of an old house in an English village. Along with the property, they have inherited some worthless bric-a-brac, including a collection of antique books. While rustling through a copy of The Black Arrow, Tuppence comes upon a series of apparently random underlinings. However, when she writes down the letters, they spell out a very disturbing message: "Mary Jordan did not die naturally."...

Tommy and Tuppence Beresford wait anxiously for a letter from Russia that may contain information of international importance hidden beneath the stamp. The letter is anticipated by more than just the Beresfords, and they must fight to keep the information from getting into the wrong hands.

A personal advertisement written in code attracts the attention of Tuppence Beresford. When Tuppence suspects that the code involves the Three Arts Ball, she persuades Tommy to attend dressed in costume. Tuppence's suspicions prove to be correct when a murder takes place, but as all of the guests are dressed in masquerade, identifying the killer may be more difficult than first thought…

When a six-foot-tall tan giant of man comes into Albert Blunt's International Detective agency, Tommy and Tuppence-married couple and detective aficionados-are in for a treat. Not only has Mr. Stavansson emerged after a two-year Arctic adventure, but he's lost his fiancée Hermione too. What telegrams and scraps of information Tommy and Tuppence can gather are all the hope the adventurer has in finding her. But this information leads the duo into...

Set during the dark days of World War II, Agatha Christie's N or M? puts two most unlikely espionage agents, Tommy and Tuppence Beresford, on the trail of a pair of Nazi spies who have murdered Britain's top agent. World War II is raging, and while the RAF struggles to keep the Luftwaffe at bay, Britain faces a sinister threat from "the enemy within"-Nazis posing as ordinary citizens. With pressure mounting, the intelligence service appoints two improbable...