"When the Beresford obtain an old house and its contents, Tuppence discovers a series of underlinings in a copy of The Black Arrow. When she writes down the letters, they spell out a very disturbing message: "Mary Jordan did not die naturally." After sixty years, Mary Jordan's enemies are still ready to kill"--

Tommy and Tuppence Beresford, two unlikely spies, help to defend their country by trying to rout out two highly placed Fifth Columnists. When Tommy is asked by the British Intelligence Service to go and stay at the Sans Souci guest house he is astonished to see Tuppence there. The mission: to identify which of the other guests is N and which is M. - Publisher.

Agatha Christie's Tommy and Tuppence Beresford are Partners in Crime-or rather partners in crime solving-and must demonstrate their deductive skills in a wide range of confounding cases after agreeing to take over Blunt's International Detective Agency. 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...

When her maid asks Miss Marple to intervene in the delicate problem of her rather opinionated cousin Gladys, she doesn't think much can be done. Poor Gladys has been accused of stealing a precious brooch belonging to her employers, the reserved Misses Skinner. While one sister malingers with mysterious ailments, the other attends to her every need, and they've both decided that Gladys must go. But, one day there appears a paragon to replace her, the...

The rather disgruntled pair of Tommy and Tuppence are sequestered in the Grand Adlington Hotel, having made a pig's ear out of their latest case. But, while mournfully sipping cocktails, with Tommy oddly dressed as a parson, they are gleefully accosted by their old acquaintance Mr. Bulger, who has London's most beautiful stage actress, Gilda Glen, in tow. Featherbrained and a little confused, Gilda takes Tommy for a real clergyman and scrawls out...

While staying with the Kingston Bruce family, Mrs. Hamilton Betts discovers that her valuable pink pearl is missing. Presuming it to have been stolen by another houseguest, the concerned host contacts the Beresfords for help.

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.