It's 1920, and Christmas is coming. Major Lennox finds a body on his doorstep - why on his doorstep? Was it to do with the Countess? Was it about the ruby necklace? Lennox goes to Melrose Court, home to his uncle, Lord Melrose, to uncover the mystery. But then, the murders begin, and it snows, and it all becomes very complicated.

In the summer of 1913, the world seems full of possibility for four very different young men. Young Jean-Baptiste dreams of the day he'll leave his Picardy home and row down-river to the sea. Earnest and hard-working Frank has come to London to take up an apprenticeship in Regent Street. His ambitions are self-improvement, a wife and, above all, a bicycle. Organ scholar Benedict is anxious yet enthralled by the sensations of his synaesthesia.

England, 1925. After years shut away from the world, former detective Lord Edgington of Cranley Hall plans a grand ball to celebrate his 75th birthday. But when someone starts bumping off members of his scheming family, the old man enlists his teenage grandson to help find the killer before one of them is next. The mismatched duo must pick the culprit from a gaggle of preening playboys, scatter-brained spinsters, and irate inspectors in this Agatha-Christie-style whodunnit that will have you racing to spot the killer. 

Kat brings Harry across the Atlantic to New York for a planned whirlwind time in her home town - complete with a lavish suite at the Plaza. But when Teddy Crowther - grandson of a wealthy City magnate - is snatched by the mob, the pair is asked to help. As Prohibition New York swelters in a heatwave, the Mortimers soon find themselves playing a dangerous game of cat and mouse, not just with the kidnappers, but also the rest of the Crowther family, all of whom have everything to gain - and maybe lose - if Teddy is found ...

England, 1920. Eleanor Swift has spent the last few years travelling the world: taking tea in China, tasting alligators in Peru, escaping bandits in Persia and she has just arrived in England after a chaotic 45-day flight from South Africa. Chipstone is about the sleepiest town you could have the misfortune to meet. But then, from the edge of a quarry, through the driving rain, Eleanor is shocked to see a man shot and killed in the distance. Before she can climb down to the spot, the villain is gone and the body has vanished.

Miss Marple meets Oscar Wilde in this new series of cosy mysteries set in the picturesque Cotswolds village of Bunburry. Life is looking up for amateur sleuth Alfie McAlister. He has found relatives he never knew he had, and at long last, he has replaced the avocado suite in his bathroom. But he is shocked to get a plea for help from his niece Ruby, a young law graduate in Oxford. There is no support from his fellow amateur sleuths: Liz and Marge are having problems of their own, and Constable Emma Hollis isn't answering her phone.

June 1933. Independent, young Kitty Underhay has been left in charge of her family’s hotel, The Dolphin, on the tranquil English coast. But when several rooms are broken into and searched, including Kitty’s own, she quickly realizes that something out of the ordinary is afoot at the hotel. Soon, rumors are flying in the cozy town that someone is on the hunt for a stolen ruby. A ruby that Kitty’s mother may well have possessed when she herself went missing during the Great War.

When Ed Finnlay - computer programmer and devoted father of two - goes missing, there's not a lot the local police can do. After all, Ed himself told them he would be gone... for quite some time. As the weeks go by with no news, his wife reaches out to Jack and Sarah for help. But they soon learn that there are odd secrets about this missing husband and that he might not only be gone, but also in serious danger. Can Jack and Sarah do what seems impossible.

In 1913, before there is a rumor of war in Europe, Matthias Wrenn and Con Hatchel, lifelong friends from Ballyrannel in the Irish midlands, decide to see the world at the expense of the king of England and join the British army. A year later, while en route to India, their troop ship is recalled and they soon find themselves in the European slaughterhouse that was World War I.

On his return from South Africa, Charles Knox is invited to spend the weekend at the country home of Sir Neville Strickland, whose beautiful wife Rosamund was once Knox's fiancee. But in the dead of night Sir Neville is murdered. Who did it? As suspicion falls on each of the house guests in turn, Knox finds himself faced with deception and betrayal on all sides, and only the enigmatic Angela Marchmont seems to offer a solution to the mystery. 

Stephen Munro, a demobbed army officer, reconciles himself to taking a job as a footman to make ends meet. Employed at Wintringham Hall, the delightful but decaying Sussex country residence of the elderly Lady Susan Carey, his first task entails welcoming her eccentric guests to a weekend house-party, at which her bombastic nephew - who recognises Stephen from his former life - decides that an after-dinner séance would be more entertaining than bridge. Then Cicely disappears!

Meet Lord James Harrington and his wife, Beth. They adore hosting seasonal events in the village of Cavendish, running their country hotel, keeping the local folklore alive and listening to the latest murder mystery on the wireless. But mysteries don’t always remain on the airwaves. James and Beth are looking forward to hosting a New Year's Eve ball, but first, they are accommodating the actors of a travelling Old West show and displaying American Indian artefacts as part of that tour.

Chief Inspector Macdonald has been invited to a treasure hunt party at the house of the Graham Coombe, the celebrated publisher of Murder by Mesmerism. The clues of the hunt have been devised by Coombe's thriller-writer friends, disguised on the night under literary pseudonyms. The fun comes to an abrupt end, however, when 'Samuel Pepys' is found murdered in the telephone room in bizarre circumstances.

London, 1925. With their band the Dizzy Heights, jazz musicians Ivor ‘Skins’ Maloney and Bartholomew ‘Barty’ Dunn are used to improvising as they play the Charleston for flappers and toffs, but things are about to take a surprising turn. 

London, 1923. Olive Belgrave needs a job. Despite her aristocratic upbringing, she’s penniless. Determined to support herself, she jumps at an unconventional job - looking into the background of her cousin’s fiancé, Alfred. Alfred burst into the upper crust world of London’s high society, but his answers to questions about his past are decidedly vague. Before Olive can gather more than the basics, a murder occurs at a posh party. Suddenly, every Bright Young Person in attendance is a suspect, and Olive must race to find the culprit.