The heiress of Styles has been murdered, dying in agony from strychnine slipped into her coffee. And there are plenty who would gain from her death: the financially strapped stepson, the gold digging younger husband, and an embittered daughter-in-law. Agatha Christie's eccentric and hugely popular detective, Hercule Poirot, was introduced to the world in this book, which launched her career as the most famous and best loved of all mystery writers.

"The Mysterious Affair at Styles" is a detective novel by Agatha Christie. It was written in the middle of World War I, in 1916, and first published by John Lane in the United States in October 1920 and in the United Kingdom by The Bodley Head on 21 January 1921. Styles was Christie's first published novel, introducing Hercule Poirot, Inspector (later, Chief Inspector) Japp, and Arthur Hastings. The story is told in first person by Hastings and features many of the elements that have become icons of the Golden Age of Detective Fiction, largely due to Christie's influence. It is set in a large, isolated country manor. There are a half-dozen suspects, most of whom are hiding facts about themselves. The book includes maps of the house, the murder scene, and a drawing of a fragment of a will, as well as a number of red herrings and surprise plot twists. "The Secret Adversary" is a work of detective fiction by Agatha Christie, first published in the United Kingdom by The Bodley Head in January 1922. The book introduces the characters of Tommy and Tuppence who feature in three other Christie books and one collection of short stories written throughout her writing career.

Agatha Christie's entry novel was the first to present Hercule Poirot, the unconventional but brilliant Belgian private detective. A young woman is poisoned at a country estate, and Poirot must find the killer.

Agatha Christie's Complete Secret Notebooks brings together for the first time Secret Notebooks and Murder in the Making, two volumes that explore the fascinating contents of her 73 notebooks. This includes illustrations, deleted extracts, unused ideas, two unpublished Poirot stories and a lost Miss Marple. When Agatha Christie died in 1976, aged 85, she had become the world's most popular author. With sales of more than two billion copies worldwide in more than 100 countries, she had achieved the impossible - more than one book every year since the 1920s, every one a bestseller. So prolific was Agatha Christie's output - 66 crime novels, 20 plays, 6 romance books under a pseudonym and over 150 short stories - it was often claimed that she had a photographic memory. Was this true? Or did she resort over those 55 years to more mundane methods of working out her ingenious crimes? Following the death of Agatha's daughter, Rosalind, at the end of 2004, a remarkable secret was revealed. Unearthed among her affairs at the family home of Greenway were Agatha Christie's private notebooks, 73 handwritten volumes of notes, lists and drafts outlining all her plans for her many books, plays and stories. Buried in this treasure trove, all in her unmistakable handwriting, are revelations and details that will fascinate anyone who has ever read or watched an Agatha Christie story. Christie archivist and expert John Curran leads the reader through the six decades of Agatha Christie's writing career, unearthing some remarkable clues to her success and a number of never-before-published excerpts and stories from her archives. This book features Agatha's original ending of her very first book, The Mysterious Affair at Styles, painstakingly transcribed from her notebooks. It also includes a number of short stories from the archives reproduced in full, including the unpublished The Man Who Knew, How I Created Hercule Poirot, and an early draft for a Miss Marple story, The Case of the Caretaker's Wife.

(Secret adversary): Investigating the case of a woman who has been missing for five years, Tommy and Tuppence Beresford uncover just enough information to solve the mystery and put their own lives in jeopardy.

This anthology of rare stories of crime and suspense brings together 16 tales by masters of the Golden Age of Detective Fiction for the first time in book form, including a newly discovered Agatha Christie crime story that has not been seen since 1922.