Mr. Satterthwaite and Colonel Melrose are comfortably ensconced in the Colonel's study when the phone suddenly rings. Someone has been murdered, and, as the county chief constable, the Colonel lets Satterthwaite accompany him to the scene of the crime. The two of them have opposing opinions on why Sir James Dwighton has been bashed over the head with a blunt instrument. Rumor had it that red-haired beauty Laura Dwighton and her guest, the very attractive Mr. Paul Delangua, were engaged in an illicit affair, and Paul was thrown out by the disgruntled Sir James. But the facts of the murder all seem to add up too nicely....

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.

A personal advertisement written in code attracts the attention of Tuppence Beresford. When Tuppence suspects that the code involves the Three Arts Ball, she persuades Tommy to attend dressed in costume. Tuppence's suspicions prove to be correct when a murder takes place, but as all of the guests are dressed in masquerade, identifying the killer may be more difficult than first thought....

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?

Just as boredom is setting in on his long trip by motor coach across the desert to Baghdad, Mr. Parker Pyne reads about the case of the missing Mr. Long, the famous defaulting financier who, as the papers would have it, is in South America. Another member of his party, Captain Smethurst, tells Pyne that he is worried about something. But before he can tell Pyne what it is, he is found dead, with no visible wound. Pyne must piece together what happened from various clues, including scraps of conversation overheard back in Damascus.

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.

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?

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.

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?

Mr. Parker Pyne is having trouble trying to get to Beirut, what with his rusty linguistic skills and the less-than-comfortable traveling arrangements. But, with the help of a German pilot, Herr Schlagel, he is soon able to get his bearings. Herr Schlagel confesses that his thoughts are dominated by the mysterious and sudden death of one of his last passengers, who was in the company of Lady Esther from the House of Shiraz. Taking the initiative, Pyne writes to Lady Esther offering his services. When he arrives at the House of Shiraz, he waits to see what the infamously mad Lady Esther has to say for herself....

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.

Major Hastings and Hercule Poirot are not interested in the mystery of the Spanish chest, which has been reported in the papers so often that it seems to be an entirely closed case. But, when Hastings persuades Poirot to attend a fabulous party given by Lady Chatterton, they discover someone sequestered upstairs who is desperate for their help. Will the contents of a dead man's pockets reveal to the inscrutable eye of Hercule Poirot who the culprit is?

Is it a gesture of goodwill or a sinister trap that lures Rupert St. Vincent and his family to a magnificent estate? How desperate is Joyce Lambert, a destitute young widow whose only recourse is to marry a man she despises? What unexpected circumstance stirs old loyalties in Theodora Darrell, an unfaithful wife about to run away with her lover?

In this collection of short stories, the answers are as unexpected as they are satisfying. The Queen of Mystery takes bizarre romantic entanglements, supernatural visitations, and classic murder to inventive new heights.

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?

Mrs. Packington felt alone, helpless, and utterly forlorn. But her life changed when she stumbled upon an advertisement in the Times that read: "Are you happy? If not, consult Mr. Parker Pyne." Equally adept at putting together the fragments of a murder mystery or the pieces of a broken marriage, Mr. Parker Pyne is possibly the world's most unconventional private investigator. Armed with just his intuitive knowledge of human nature, he is an Englishman abroad, traveling the globe to solve and undo crime and misdemeanor.