A group of adventurers set out from Damascus to visit the legendary Gate of Baghdad, also known as the Gate of Death. When one of the party is found dead, the others look to the seemingly unimpeachable Mr Parker Pyne.

Polina Nazarova is a soprano whose past is dangerously entangled with the present. Given the opportunity to sing her Tosca opposite the arrogant and cruel Andre Breon, it seems that her desire for revenge may prove irresistible.

The year is 1920, and an ambitious doctor meets a nun apparently traumatised by what she witnessed in the Great War. An attempt to restore the woman's sanity results in the uncovering of something very sinister indeed.

Lady Tresselian invites several guests to stay at her seaside house at Gull’s Point. Against her better judgment she has allowed her late husband’s ward, handsome tennis ace Neville Strange, and his wife Kay to come at the same time as Neville’s ex-wife Audrey. Other guests include Mary, Lady Tresselian’s companion; Ted, Kay’s ever-present friend; Thomas, a family friend who has just returned from spending the war in Africa and Lady Tresselian’s old friend Lord Justice Treves.

This is the very first Poirot/Hastings story. Set in 1916, we meet Captain Hastings as he is invalided out of the Great War and goes to convalesce at Styles Court, the family home of his great friend, John Cavendish. By an extraordinary coincidence, billeted in the village is a brilliant little retired detective with an egg-shaped head, who made a considerable impression on the Captain when he was in Belgium. Styles is not a happy household and in the blistering summer heat, tensions mount.

Theo is determined to seek happiness with her husband's business rival, Vincent. Having fled London for Paris, however, she soon learns of Richard's financial collapse - and discovers that rather more than just his job is at stake.

A foggy night... a lonely country house... and a woman with a gun in her hand quietly surveying the dead body of her husband. It looked like a straightforward case of murder. Or was it? As the ghosts of an old wrong begin to emerge from the past, the case begins to look anything but straightforward... First staged at the Duchess Theatre in London in 1958, this play ran for 604 performances and is as gripping and ingenious as you would expect from the Queen of Crime.

Carla Lemarchant was a child of five when her mother was accused and convicted of poisoning her father, the famous painter Amyas Crale. After Caroline Crale dies in prison, Carla is sent to live with her uncle and aunt in Canada. Only on her 21st birthday does Carla learn of her family history when she reads a letter written by Caroline before her death, in which she denies murdering her husband. But if her mother didn't kill Amyas Crale, who did?

A man witnesses a murderous attack on a young woman in a mirror - yet when he turns round there is nothing there. Can he prevent a premonition coming true? Basic human loyalty and jealousy are at the fore in this chilling tale.

As the year comes to a close, Sherlock Holmes and Dr Watson must set out through snow laden London to investigate the theft of a priceless clock and the receipt of seven macabre Christmas cards. Will they solve the murderous mystery before they too receive the unwanted 'compliments of the season'? Written by esteemed writer, Anthony Horowitz, and originally published in the Daily Mail, this short story is a festive treat for all fans of Sir Arthur Conan Doyle's famous detective, Sherlock Holmes.

Gwenda Reed arrives from New Zealand, travelling ahead of her husband with the task of finding the perfect place to make their base. In the quiet village of Dilmouth, she finds a house with immediate appeal. A few renovations will convert it into her ideal home. Then things get very strange indeed. Wanting porch stairs, Gwenda hires a builder to put them in - only to find some old steps, covered up by bushes.

A triple bill of archive BBC radio dramas, believed lost for over half a century and only recently rediscovered. "Butter in a Lordly Dish", written specially for radio in 1948, features Richard Williams as Sir Luke Enderby KC, whose infidelities lead him into trouble when he goes to meet his latest flame. Williams also stars as Hercule Poirot in "Murder in the Mews", a 1955 adaptation of a short story. A young woman is found dead in her flat the day after Guy Fawkes night.

There's Rosemary, that's for remembrance. Published in 1945, "Sparkling Cyanide" is all about remembrance. It begins with six characters recalling the horrific death of Rosemary Barton, a beautiful but shallow young heiress poisoned by a cyanide-spiked glass of champagne whilst celebrating her birthday at a smart London restaurant.

When Alex and Terry set up their own e-commerce company in Philomel Cottage, everything looks rosy until money goes missing from Alex's account. Soon she is questioning her partner - and, indeed, the cottage itself….

BBC Radio 4 full-cast dramatisation starring June Whitfield as the sharp-witted spinster sleuth. Dolly Bantry, mistress of Gossington Hall, is enjoying a pleasant doze when suddenly her dreams take a strange turn. The housemaid Mary is telling her that there is a body in the library.