A few weeks after marrying an attractive young widow, Gordon Cloade is tragically killed by a bomb blast in the London blitz. Overnight, the former Mrs Underhay finds herself in sole possession of the Cloade family fortune. Shortly afterwards, Hercule Poirot receives a visit from the dead man's sister-in-law, who claims she has been warned by "spirits" that Mrs Underhay's first husband is still alive.

Mrs McGinty died from a brutal blow to the back of her head. Suspicion fell immediately on her shifty lodger, James Bentley, whose clothes revealed traces of the victim's blood and hair. Yet something was amiss: Bentley just didn't look like a murderer.

When Cora is savagely murdered with a hatchet, the extraordinary remark she made the previous day at her brother Richard's funeral suddenly takes on a chilling significance. In desperation, the family solicitor turns to Hercule Poirot to unravel the mystery.

An outbreak of kleptomania at a student hostel was not normally the sort of crime that aroused Hercule Poirot's interest. But then he saw the list of stolen and vandalized items: a stethoscope, some old flannel trousers, a box of chocolates, a slashed rucksack, and a diamond ring found in a bowl of soup. The list made absolutely no sense at all. But, reasoned Poirot, if this was merely a petty thief at work, why was everyone at the hostel so frightened?

The dentist was found with a blackened hole below his right temple. A pistol lay on the floor near his out-flung right hand. Later, one of his patients was found dead from a lethal dose of local anaesthetic. It's a clear case of murder and suicide. But why would a dentist commit a crime in the middle of a busy day of appointments? A shoe buckle holds the key to the mystery. Now, in the words of the rhyme, can Poirot pick up the sticks and lay them straight?

Mr Shaitana was famous as a flamboyant party host. Nevertheless, he was a man of whom everybody was a little afraid. So, when he boasted to Poirot that he considered murder an art form, the detective had some reservations about accepting a party invitation to view Shaitana's private collection.

Among the towering red cliffs of Petra, like some monstrous swollen Buddha, sat the corpse of Mrs Boynton. A tiny puncture mark on her wrist was the only sign of the fatal injection that had killed her.

Beautiful Caroline Crale was convicted of poisoning her husband, yet there were five other suspects: Philip Blake (the stockbroker) who went to market; Meredith Blake (the amateur herbalist) who stayed at home; Elsa Greer (the three-time divorcee) who had roast beef; Cecilia Williams (the devoted governess) who had none; and Angela Warren (the disfigured sister) who cried ‘wee wee wee’ all the way home.It is sixteen years later, but Hercule Poirot just can’t get that nursery rhyme out of his mind…

From seat No.9, Hercule Poirot was ideally placed to observe his fellow air passengers. Over to his right sat a pretty young woman, ahead, across the gangway in seat No.8, a detective writer was being troubled by an aggressive wasp. What Poirot did not yet realize was that behind him, in seat No.2, sat the slumped, lifeless body of a woman.

In appearance Hercule Poirot hardly resembled an ancient Greek hero. Yet, reasoned the detective, like Hercules he had been responsible for ridding society of some of its most unpleasant monsters. So, in the period leading up to his retirement, Poirot made up his mind to accept just 12 more cases: his self-imposed "labours". Each would go down in the annals of crime as a heroic feat of deduction.

Late one night, two teachers investigate a mysterious flashing light in the sports pavilion, while the rest of the school sleeps. There, among the lacrosse sticks, they stumble upon the body of the unpopular games mistress, shot through the heart from point blank range.

As instructed, stenographer Sheila Webb let herself into the house at 19 Wilbraham Crescent. It was then that she made a grisly discovery: the body of a dead man sprawled across the living-room floor. What intrigued Poirot about the case was the time factor. Although in a state of shock, Sheila clearly remembered having heard a cuckoo clock strike 3.00. Yet, the four other clocks in the living room all showed the time as 4.13. Even more strange: only one of these clocks belonged to the owner of the house.

Framed in the doorway of Poirot's bedroom stood an uninvited guest, coated from head to foot in dust. The man's gaunt face stared for a moment, then he swayed and fell. Who was he? Was he suffering from shock or just exhaustion? Above all, what was the significance of the figure four, scribbled over and over again on a sheet of paper? Poirot finds himself plunged into a world of international intrigue, risking his life to uncover the truth about "Number Four".

When the luxurious Blue Train arrives at Nice, a guard attempts to wake serene Ruth Kettering from her slumbers. But she will never wake again, for a heavy blow has killed her, disfiguring her features almost beyond recognition. What is more, her precious rubies are missing.

Sir George and Lady Stubbs, the hosts of a village fête, hit upon the novel idea of staging a mock murder mystery. In good faith, Ariadne Oliver, the well known crime writer, agrees to organise their murder hunt. Despite weeks of meticulous planning, at the last minute Ariadne calls her friend Hercule Poirot for his expert assistance. Instinctively, she senses that something sinister is about to happen. Beware: nobody is quite what they seem!