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.

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 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.

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.

A middle-aged man in search of adventure, Bobby Roberts answers an advert in The Times and is dispatched to Milan, to collect a harmless package from a scientist. However, he very soon gets caught up in a terrifying murder.

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.

Octavia's triumphant new dress designs are the only thing on her mind - but is it safe to ignore the ominous dressmaker's doll which appears in her workshop? The cut-throat fashion industry provides this story's backdrop.

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.

Having lost her husband and only child to the war in Afghanistan, a young woman turns to an Irish couple for hope in the form of a miracle. But dark forces are at work, and the price to pay for salvation may be too much to bear.

When the Cowley sisters employ a carer to look after the ailing Carmela, Morag appears to suit their needs perfectly. But after a spectacular jewel theft on the night of the Hunt Ball, it appears that the perfect carer might be implicated.

Miss Marple is told that her old friend, Carrie, is in danger and she goes to stay with her at Stoneygates, a home for maladjusted adolescents. While she is there, tragedy strikes as Carrie's step-son, Christian Gulbrandsen, is shot dead. There are at least seven suspects and two more murders follow. But the man with the obvious motive has a cast-iron alibi, as he could hardly be in two places at once - or could he? June Whitfield once again stars as the indomitable amateur detective.

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.

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.

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?