When a number of leading scientists disappear without a trace, concern grows within the international intelligence community. Are they being kidnapped? Blackmailed? Brainwashed? One woman appears to have the key to the mystery. Unfortunately, Olive Betteron now lies in a hospital bed, dying from injuries sustained in a Moroccan plane crash.

In a remote house in the middle of Dartmoor, six shadowy figures huddle around a small table for a seance. Tension rises as the spirits spell out a chilling message: "Captain Trevelyan...dead...murder."

Clarissa, the wife of a Foreign Office diplomat, is given to daydreaming. "Supposing I were to come down one morning and find a dead body in the library, what should I do?" she muses. Clarissa has her chance to find out when she discovers a body in the drawing-room of her house in Kent. Desperate to dispose of the body before her husband comes home with an important foreign politician, Clarissa persuades her three house guests to become accessories and accomplices.

Here are 12 ingenious, witty mysteries showing the author at her best, including: the curious disappearance of Lord Listerdale, the strange meeting on a train of a feckless man and a beautiful girl, and Philomel Cottage and the extraordinary country house visit of Edward Robinson. Each is expertly narrated by Hugh Fraser.

Three single girls shared the same London flat. The first worked as a secretary; the second was an artist; the third, who came to Poirot for help, disappeared, convinced she was a murderer. Now there were rumours of revolvers, flick-knives, and blood stains. But, without hard evidence, it would take all Poirot's tenacity to establish whether the third girl was guilty, innocent - or insane.

The Leonides are one big happy family living in a sprawling, ramshackle mansion - until the head of the household, Aristide, is murdered with a fatal barbiturate injection. Suspicion naturally falls on the old man's young widow, 50 years his junior. But the murderer hasn't reckoned on the tenacity of Charles Hayward, fiancé of the late millionaire's granddaughter.

Dr. Arthur Calgary takes a ferry across the Rubicon River to Sunny Point, the home of the Argyle family. A year before, the matriarch of the family was murdered and a son, Jack, was convicted and sentenced to spend the rest of his life in prison. Dr. Calgary is surprised when his revelation has a disturbing effect on the family: it means one of the family is a murderer.

What is the connection between a failed suicide attempt, a wrongful accusation of theft against a schoolgirl, and the romantic life of a famous tennis player? To the casual observer, apparently nothing. But when a houseparty gathers at Gull's Point, the seaside home of an elderly widow, earlier events come to a dramatic head. It's all part of a carefully paid plan for murder.

When Tommy and Tuppence visit an elderly aunt in her gothic nursing home, they think nothing of her mistrust of the doctors; after all, Ada is a very difficult old lady. But when Mrs Lockett mentions a poisoned mushroom stew, and Mrs Lancaster talks about "something behind the fireplace", Tommy and Tuppence find themselves caught up in an unexpected adventure involving possible black magic.

When a stranger runs his car into a ditch in dense fog near the South Wales coast, and makes his way to an isolated house, he discovers a woman standing over the dead body of her wheelchair-bound husband, a gun in her hand. She readily admits to murder, and the unexpected guest offers to help her concoct a cover story.

All great crime writers have their favourite creations. Similarly, every great sleuth has his, or her, own preferred method of deduction. Take the charming Parker Pyne, who relies upon an intuitive knowledge of human nature to solve the 'Problem at Pollensa Bay'. Or Mr Satterthwaite, who seeks inspiration through his collaboration with the enigmatic Mr Quin in 'The Harlequin Tea Set' mystery. Then, of course, there's Poirot, whose measured analysis of motive and opportunity is tested to the full in 'Yellow Iris', when he receives an anonymous call about a matter of life and death. 

Agatha Christie's world-famous mystery thriller, reissued with a striking new cover designed to appeal to the latest generation of Agatha Christie fans and book lovers. Ten strangers, apparently with little in common, are lured to an island mansion off the coast of Devon by the mysterious U.N. Owen. Over dinner, a record begins to play, and the voice of an unseen host accuses each person of hiding a guilty secret. That evening, former reckless driver Tony Marston is found murdered by a deadly dose of cyanide.

Baghdad is the chosen location for a secret summit of superpowers, concerned but not convinced, about the development of an, as yet, unidentified and undescribed secret weapon. Only one man has the proof that can confirm the nature of this fantastic secret weapon, a British agent named Carmichael. Unfortunately the criminal organisation responsible for the weapon's development will stop at nothing to prevent him entering Baghdad and presenting his proof to the assembled delegates.

Soon after Gwenda moved into her new home, odd things started to happen. Despite her best efforts to modernise the house, she only succeeded in dredging up its past. Worse, she felt an irrational sense of terror every time she climbed the stairs. In fear, Gwenda turned to Miss Marple to exorcise her ghosts. Between them, they have to solve a 'perfect' crime committed many years before.

Inspector Japp summons Poirot to a London house where Guy Fawkes Night fireworks appear to have drowned out the noise of a young widow shooting herself through her left temple. But the pistol is in her right hand, and the police are convinced that this must be a case of murder.