On a dark evening, Mr. Harley Quin appears at the door of Royston Hall under the premise that his car has broken down. Once inside, he embarks upon the tragic tale of Royston Hall's former occupants, leading to a dramatic change in the perceptions of the current inhabitants - but has Mr. Quin's revelation come too late?

At Mr. and Mrs. Unkerton's party in Greenway's House, Mr. Satterthwaite learns of a haunted window: No matter how many times it is replaced, it always contains the image of a gentleman in a plumed hat. When gunshots are heard, Satterthwaite finds that two of the guests have been shot dead, which is shortly followed by a sighting of the gentleman in the newly-replaced windowpane. Can Mr. Quin shed light on the mystery?

Waiting for his car to be fixed, Mr. Satterthwaite sits in a tea shop called the Harlequin cafe, thinking of his friend Harley Quin, whom he hasn’t seen in many years. Then, in a burst of sunshine, the very same Mr. Quin walks through the door, along with his diligent dog, Hermes. Satterthwaite is telling him the very long history of the family he is off to visit, when their conversation is interrupted by the abrupt entrance of a member of that very same family, intent upon replacing her harlequin cups.

When Mr. Satterthwaite visits a new exhibit at the Harchester Galleries, there is one painting that bears an unusual likeness to a mysterious acquaintance of his, Mr. Quin. In one bold move he purchases the canvas on the spot, and in another invites the artist of "The Dead Harlequin" to dine with him that night, with an empty place at the table set for Mr. Quin. Dinner conversation soon turns to the setting of "The Dead Harlequin", the doomed and ghostly house Charnley, where many have perished under tragic circumstances.

When civilian life proves too dull for Major Wilbrahams, he contacts Parker Pyne to escape his boredom. Pyne's assistant arranges a chance meeting with the beautiful Freda Clegg and the two join forces, but on leaving for Africa they encounter more than they had bargained for.

James has found himself at the fashionable resort Kimpton-on-Sea, all due to the persuasion of his girlfriend, Grace, who during the last few months of their courtship has become more difficult to deal with. Among the upper echelons of society, including the Rajah of Maraputna, James feels disgruntled and out of place. Eager to both irritate and win over Grace, James bypasses the queue to the changing rooms and ducks into the private huts on the beach so that he can be the first into the sea. It is only later that he realizes he has accidentally come into possession of a very valuable and sought-after object.

At a séance, Sir Alington, a venerable expert of the mental condition, is pestered by Mrs. Eversleigh about the importance of the sixth sense. Soon, a young man named Dermot is drawn in and tells them both about the sixth sense he experiences, a red signal that spells danger. He is about to tell them of the last time he saw the red signal when he stops himself. The last time he had the signal was earlier that very evening. But how could there be danger at a simple gathering of old friends?

Jane Cleveland is in desperate need of a job, and when she sees an ad for a woman of her description needed to impersonate a grand duchess, she cannot believe her luck. The royal retainers tell Jane that the job will be dangerous because attempts have been made on the Grand Duchess Pauline's life, but this only serves to make the job more appealing. Jane's disguise initially goes according to plan, but when she is kidnapped and drugged, it appears that her new employers are not all that they seem....

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.

Hercule Poirot is about to tuck into a very traditional English supper with his old friend Bonnington when a lone diner sparks his interest. Like clockwork, the man has eaten at the restaurant on Thursdays and Tuesdays for the last 10 years, but no one on the staff knows his name. When "Old Father Time", as they have fondly nicknamed him, suddenly stops coming, Poirot believes that he might have picked up the one essential clue that could shed light on this mysterious man. Could what Old Father Time ordered as his final meal provide the key?

There's a body in a trunk; a dead girl's reflection is caught in a mirror; and one corpse is back from the grave, while another is envisioned in the recurring nightmare of a terrified eccentric. What's behind such ghastly misdeeds? Try money, revenge, passion, and pleasure. With multiple motives, multiple victims, and multiple suspects, it's going to take a multitude of talent to solve these clever crimes. In this inviting collection, Agatha Christie enlists the services of her finest - Hercule Poirot, Miss Marple, and Parker Pyne.

Lytcham Close, one of the oldest stately homes in England, is owned by the last remaining heir and ruled by his intolerable whims. Old Hubert demands complete silence when he plays music and times dinner exactly by a resounding gong. Rushing down at the sound of the second - or is it the first? - gong, Joan Ashby is about to find out that not only is dinner delayed, but something is going on that no one can explain. Everyone is thrown into disarray when Old Hubert never materializes and instead a new guest is announced: Hercule Poirot himself.

An alarming telephone call, in which the phrases “it’s life and death” and “the table with the yellow irises” are whispered, causes Hercule Poirot to rush to the luxuriant restaurant Jardin des Cygnes, desperate to stop an impending murder and find the person behind the voice on the phone. After bumping into an old acquaintance, he is invited to join a dinner party in full swing. But, just as the dancing and champagne are overflowing, a morbid announcement is made and the lights go out.

The recently married Alix Martin is obsessed with a recurring dream of her new husband's murder. Each time she can see the murderer clearly, and it's the mild-mannered man she had previously been engaged to, taking his revenge. But, what's worse is that at the end of the dream she thanks the murderer. Perplexed, Alix tries to calm herself by spending time in the garden of her picturesque cottage. But her gardener confuses her further by wishing her well on her trip to London - a trip which Alix knows nothing about. Now Alix is scared: Is the gardener imagining things, or is she?

An aging, heavily-insured country squire whose estate is in financial ruin is thought to have committed suicide. Hercule Poirot investigates, in the guise of a representative of the victim's insurance company, to uncover the identity of the real murderer.