The ingredients of this mystery plot run all the way from the fancies of some old ladies in a home for the elderly, to dark hints at child murder, the machinations of a clever criminal gang, and the secret life of a supposedly peaceful English village.

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...

Tommy and Tuppence Beresford are restless for adventure, so when they are asked to take over Blunt's International Detective Agency, they leap at the chance. Their first case is a success-the triumphant recovery of a pink pearl. Other cases soon follow-a stabbing on Sunningdale golf course; cryptic messages in the personal columns of newspapers; and even a box of poisoned chocolates. But can they live up to their slogan of "Any case solved in 24 hours"?...

Throwing on an almost convincing French accent, Tommy is determined to act the Great Detective Hanaud to his and Tuppence's latest, lovely client. Miss Hargreaves has recently received a box of chocolates from nobody knows who, and, due to her dislike of chocolates, was the only one to not fall afoul of the arsenic-spiked treats. But, Miss Hargreaves is not the first recipient of such a gift; three other large country houses have received arsenic-laced...

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.

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...

Previously published in the print anthology Partners in Crime. The monogrammed kit bag of the American ambassador to England, Randolph Wilmot, is switched with Senator Ralph Westerman's. Wilmot hires Tommy and Tuppence to find out why. When the senator's valet shows up at the embassy to exchange the bags, they discover that the senator has never heard of this valet, or of any confusion between kit bags. Who is the valet, and why did he need the bag?...

Previously published in the print anthology Partners in Crime. A woman inherits a large house from her old aunt, but she has no means of maintaining it. She must take in lodgers to make ends meet, but, unfortunately, the house seems to be inhabited by poltergeists. This makes it rather hard to retain tenants. Tommy and Tuppence investigate.

Previously published in the print anthology Partners in Crime. Tommy and Tuppence Beresford are called to duty at an international detective agency. On assignment, they are told to be wary of the number sixteen. If they see it in writing or hear it in conversation with a stranger, that means they are close to finding the spy ring they seek.

Previously published in the print anthology Partners in Crime. The Beresfords finally come face to face with their secret adversary. In order to crack the case, they must ape the techniques of the great Hercule Poirot.