Just after midnight, a snowdrift stopped the Orient Express in its tracks. The luxurious train was surprisingly full for the time of the year. But by the morning there was one passenger fewer. An American lay dead in his compartment, stabbed a dozen times, his door locked from the inside.

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.

As Hercule Poirot sifts through his post one particular morning, he alights upon a letter from an elderly and (as it transpires), exceedingly rich spinster - Miss Emily Arundell. She is clearly in great distress and seeking his help, but doesn’t say why. Her only specific mention is ‘the incident of the dog’s ball’. However, what intrigues Poirot is the date of the communication - it was written two months ago. He persuades Captain Hastings that they must visit the lady with all haste.

A millionaire strikes a deal on the seedier side of Paris and a priceless cache of rubies becomes destined for his beloved daughter Rachel. Two days later Rachel is dead - murdered on a train on her way to the Riviera to meet her scoundrel lover: a mysterious, dark man. The suspects line up... only master slueth Hercule Poirot can unravel the mystery and find the truth. Maurice Denhham stars as the great Belgian detective in this BBC Radio 4 full-cast dramatisation.

A blizzard has hit England. In the tiny village of Sittaford, on the fringes of Dartmoor, a party of six is gathered in Sittaford House, home of Captain Trevelyan. He has rented the house out for the winter and is staying in a nearby village. As evening draws in, a seance is proposed. But it reveals more than they had anticipated - TREVELYAN DEAD, spells out the board. Slowly the table begins to rock again, spelling out the word M-U-R-D-E-R. Is it true? And who would kill a man who doesn’t have an enemy in the world?

John Moffatt stars as the Belgian detective Hercule Poirot. The ABC Murders: A chilling letter sets the sleuth on the trail of an enigmatic killer. After the Funeral: A wealthy businessman is dead, and his sister thinks it was murder. Death on the Nile: Poirot is in Egypt when a chilling murder takes place. Peril at End House: Whilst on holiday, the sleuth encounters a young woman, a hat and a bullet. The Murder of Roger Ackroyd: Mrs Farrars is found dead, one year after the death of her husband.

A BBC Radio 4 full-cast dramatisation starring June Whitfield as Miss Marple, the sharp-witted spinster sleuth. In the sleepy little English country village of St Mary Mead, all is not as it seems. Under a seemingly peaceful exterior lurks intrigue, guilt, deception - and murder. Colonel Protheroe, local magistrate and overbearing landowner, is the most detested man in the village. Everyone, even the vicar, wishes he were dead. And very soon he is - shot in the head in the vicar's own study.

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.

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.

A BBC Radio 4 full-cast dramatisation starring June Whitfield as Miss Marple, the deceptively mild spinster sleuth. Wealthy businessman Rex Fortescue is found dead with rye grain in his pocket. His death is followed in quick succession by a woman dying while eating bread and honey, and a maid in her garden. Inspector Neele, in charge of investigating the spate of murders, consults with Miss Marple, who has an interesting and surprising theory to offer.

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.

John Moffatt stars as the great Belgian detective in a BBC Radio 4 full-cast dramatisation. Famous crime novelist Ariadne Oliver, visiting her friend Judith Butler in the little town of Woodleigh Common, is invited to a Hallowe'en Party put on by society hostess Mrs Rowena Drake for the local teenagers. During her preparations for the party, the conversation turns to Ariadne's grisly novels....

Harry Potter has never even heard of Hogwarts when the letters start dropping on the doormat at number four, Privet Drive. Addressed in green ink on yellowish parchment with a purple seal, they are swiftly confiscated by his grisly aunt and uncle. Then, on Harry's eleventh birthday, a great beetle-eyed giant of a man called Rubeus Hagrid bursts in with some astonishing news: Harry Potter is a wizard, and he has a place at Hogwarts School of Witchcraft and Wizardry. An incredible adventure is about to begin!

Tom Hiddleston ( The Night Manager) stars as Jonathan Harker, with David Suchet ( Poirot) as Dracula in Liz Lochhead's powerful BBC radio adaptation of the classic novel by Bram Stoker. When solicitor Jonathan Harker sets off for Transylvania to sell the mysterious Count Dracula a Gothic mansion, his bride-to-be, Mina, begs him to stay - to no avail. But on arrival at Dracula's castle, deep in a black forest surrounded by wolves, Harker wishes he had listened to his fiancée.

Crime sleuth Hercule Poirot returns in a thrilling BBC Radio 4 dramatisation. Amy Leatheran has never felt the lure of the mysterious East, but when she travels to an ancient site deep in the Iraqi desert to nurse the wife of a celebrated archaeologist; events prove stranger than she could ever have imagined. Her patient’s bizzarre visions and nervous terror seem unfounded, but as the oppressive tension in the air thickens, events come to a terrible climax - in murder...