In September 1926, the Honorable Daisy Dalrymple Fletcher visits Sybil Sutherby, a school friend now living in Derbyshire as the confidential secretary to a novelist. Suspecting that something is seriously amiss, Sybil has asked Daisy to discretely investigate. Upon arrival, Daisy finds a household of relatives and would-be suitors living off the hospitality of Humphrey Birtwhistle, who had been supporting them through his thrice-yearly, pseudonymous Westerns. When he took ill, though, Sybil took over writing them while he recovered, only to see the sales increase. Now, she fears that someone in the household is poisoning Birtwhistle to keep him ill and Sybil writing the better-paying versions.

In the late 1920s in England, the Honorable Daisy Dalrymple Fletcher is recruited to help her cousin Edgar - i.e. the Lord Dalrymple. About to turn 50, Lord Dalrymple decides it is time to find out who would be the heir to the viscountcy. With the help of the family lawyer, who advertises Empire-wide, they have come up with four potential claimants. For his fiftieth birthday, Edgar invites those would-be heirs - with Daisy and the rest of the family - to Fairacres, the family estate.

In March of 1926, Daisy Dalrymple Fletcher and her friend and collaborator, Lady Lucy Gerald, head off for several days to a stately home reputed to have the best grotto in the country. Working on a book of architectural follies, they plan to research and photograph it. Leaving her husband and young twins behind, Daisy is expecting a productive weekend at Appsworth Hall, with the only potential difficulty being keeping Lucy from offending the current owner, a manufacturer of plumbing products. Alas, it's not to be quite so simple.

In England in the late 1920s, the Honourable Daisy Dalrymple Fletcher, on a convalescent trip to the countryside, goes to visit three old school friends in the area. Daisy and her husband Alec - Detective Chief Inspector Alec Fletcher, of Scotland Yard - go for a Sunday lunch with Daisy’s friends, where one of the women mentions a wine cellar below their house, which remains curiously locked, no key to be found. Alec offers to pick the lock, but when he opens the door, what greets them is not a cache of wine but the stench of a long-dead body.

April 1928: Daisy Dalrymple Fletcher is visited in London by her young cousins. On the list of must-see sites is the Crystal Palace. Discovering that her children's nanny, Nanny Gilpin, has never seen the Palace, Daisy decides to make a day of it - bringing her cousins, her three-year-old twins, her step-daughter Belinda, the nurserymaid, and Nanny Gilpin. Yet this ordinary outing goes wrong when Mrs. Gilpin goes off to the ladies room and fails to return. When Daisy goes to look for her, she doesn't find her nanny but instead the body of another woman dressed in a nanny's uniform.

In early 1925, the Honorable Daisy Dalrymple Fletcher - recent mother of twins - resumes her journalistic career by agreeing to write a piece about the Tower of London - the Bloody Tower - for an American magazine. Invited to observe the centuries-old ritual Ceremony of the Keys, she's spending the night (her first time away from her babies), since the complex is locked and guarded, and the high walls are surrounded by a disused moat.

In the winter of 1924, Daisy Dalrymple Fletcher travels to a school friend's house to witness the estate's famous Guy Fawkes celebration. But she gets more than the quiet weekend at the quaint family manse that she was originally hoping for. The home is the site of some severe family tension. The Viscount and head of the family is a strict and unyielding sort, insisting that everyone - especially his children - meet his own unreasonable expectations. On the evening of the Guy Fawkes celebration, the Viscount is found dead on the floor of his study, killed by his own hand.

The inimitable Daisy Dalrymple Fletcher and her husband Detective Chief Inspector Alec Fletcher seem to get a reprieve from their sleuthing duties when they are invited to the wedding of their friend, Lucy Fotheringay. Lucy's grandfather is hosting the ceremony at his beautiful estate and so it promises to be a typical affair with hordes of gossipy aunts and other colorful, but not necessarily pleasant, relatives. Daisy meets all these characters and observes the ensuing familial fraternization with a certain kind of amusing nonchalance.

One morning in April 1924, the Honorable Daisy Dalrymple Fletcher finds herself in a most unenviable position. Despite her best attempts to elude the inevitable, she must face her darkest fears and with all the strength and courage she can muster, must confront the one person she has tried hardest to avoid - the dentist. But upon arriving for her appointment, she finds the waiting room deserted and adjoining examination room locked, with no hint of either Dr. Talmadge or his nurse.

In the summer of 1924, the Honourable Daisy Dalrymple Fletcher is off on a holiday by the sea with her step-daughter Belinda, Belinda's chum Deva, and Daisy's husband, Detective Chief Inspector Alec Fletcher of Scotland Yard. Daisy is anticipating a relaxing, nondramatic holiday. But Daisy doesn't have that kind of luck.

In December 1923, the formidable Dowager Viscountess Dalrymple has decided that for Christmas the family will all gather at Brockdene in Cornwall at the invitation of Lord Westmoor. Her daughter - Daisy Dalrymple Fletcher - is somewhat less than pleased but yields to the demands of her mother, especially as she'll be there just before the holidays working on another article for Town and Country about the estate itself. But the family gathering quickly goes awry.

In late 1926, the newly married Daisy Dalrymple and Detective Chief Inspector Alec Fletcher of Scotland Yard take an ocean voyage to America for their honeymoon. Daisy and Alec are accompanied by Daisy's childhood friend, Phillip Petrie; his wife, Gloria; and Gloria's father, American millionaire industrialist Caleb P. Arbuckle, and all are looking forward to a pleasant, uneventful trip. But at the last minute they are joined by Arbuckle's new friend, Yorkshire millionaire Jethro Gotobed, and his new wife, Wanda.

In the summer of 1923, the Honorable Daisy Dalrymple makes what should be an uneventful research trip to the Museum of Natural History quite an eventful day - with her nephew, Derek, and her soon-to-be stepdaughter, Belinda, in tow. But as she interviews the various curators for her article on the museums of London, she soon discovers that the Museum of Natural History is a hothouse of professional rivalry and jealousy.

In the 1920s, in post - World War I England, the Honorable Daisy Dalrymple, newly engaged to Detective Inspector Alec Fletcher, is asked by her brother-in-law to discreetly investigate a series of poisoned pen letters that many of the local villagers have been receiving. When the pompous and unbearable brother of the local vicar is killed by a very large rock, dropped on his head from a great height, it seems clear to all that this campaign of gossip has escalated to murder.

In spring a young man’s fancy will turn to love, and the Honorable Phillip Petrie is no exception. Daisy’s chum is totally smitten with Miss Gloria Arbuckle, daughter of a millionaire Yank. But before the enthusiastic suitor can pop the question, his beloved is abducted. As a distraught Mr. Arbuckle begins assembling the ransom, Phillip enlists Daisy to help him recover his missing sweetheart.