London, 1941: Miss Jane Treen is at her desk, strong black coffee in hand and fluffy ginger cat by her side, when her top-secret government work is interrupted by an urgent call to Devon. A woman has been found dead in a lake in a place where she shouldn’t have been. Jane needs to gather the clues and find the killer before someone else from the agency gets hurt… Shy and handsome code-breaker Arthur Cilento is bewildered by the arrival of the efficient Miss Treen and her cat Marmaduke.

1890. American heiress, Cora Beaumont is celebrating her engagement to Terrance Tristan, the second son of a duke. Their union will solidify Cora's place in British society and put her in a rare position of power, but as they embark on the Lady Air’s maiden voyage to England, Cora soon finds that not everyone in society is accepting of her recent engagement, and tensions fly as high as the airship. When a body is discovered the first night on the ship, with a calling card for Cora on the victim, she’s determined to find the killer hidden among the passengers before they come for her next.

During 1958, with a predominantly male workforce, societal norms dictate women should be compliant, fashionable housewives. To Ariadne Winter, the sole tradition she aims to embrace is that of being fashionable. Amidst the ambiance of Ivy Tree Inn, where she's been dispatched as a writer for Ladies' Lifestyle magazine, her focus wavers as she grapples with an interview assignment concerning a Hollywood starlet on the cusp of royal matrimony—an event hailed as the "Wedding of the Century."

Edinburgh, 1948. Welfare Officer Helen Crowther has enough on her plate between her hectic job, her complicated love life, and her growing reputation as a troublemaker. Last year's scandal did nothing to help with the disapproval she already gets as a woman in her line of work. All she wants now is to focus on doing what she loves: helping the poor of the Fountainbridge ward in the city of Edinburgh. The last thing she needs is another string of murders to distract her . . .

Pearl Fitzgerald arrives in Limehouse - London's very ­first Chinatown - to settle her late father's affairs and claim her inheritance. But when she unwittingly ­finds herself at the scene of a murder, her plans are thrown off course. Even more so by the alluring Mei, sister to the dead man. Utterly infatuated, Pearl promises Mei that she will bring her brother's killer to justice, and she dives into the East End's criminal underworld.

In 1789 Wolfgang Amadeus Mozart visits the grave of Johann Sebastian Bach in Leipzig, looking for a sign, a signal, an answer to an enigma that has haunted him since childhood: Was Bach murdered by a famous oculist? And years later, was Handel a victim of the same doctor? Allegro follows his investigation, from the salons of London to the streets of Paris, recreating an enthralling and turbulent time, full of rogues and brilliant composers, charlatans and presumptuous nobles. Running parallel to this search is the rise of Mozart, his knowledge and fame, his trials and losses.

Maggie Webb has lived the last decade caring for elderly husband, Stanley, as memory loss gradually erases all the beautiful moments they created together. It's the loneliest she's ever felt in her life. When a mysterious stranger named Hassan appears at her door, he reveals a shocking truth: Stanley isn't losing his memories. Someone is actively removing them to hide a long-buried secret from coming to light. If Maggie does what she's told, she can reverse it. She can get her husband back.

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.

It's 1811, and the threat of revolution haunts the upper classes of King George III's England. Then a beautiful young woman is found savagely murdered on the altar steps of an ancient church near Westminster Abbey. A dueling pistol found at the scene and the damning testimony of a witness both point to one man - Sebastian St. Cyr, Viscount Devlin, a brilliant young nobleman shattered by his experience in the Napoleonic Wars.

Librarian Sylvia Ashe knows nothing about her past, having grown up without a father and a mother who refused to discuss him. When she stumbles upon a diary that suggests she's descended from magicians, she's skeptical. After all, magicians are special, and she's just an ordinary woman who loves books. She seeks answers from a member of the most prominent family of magicians, but she quickly learns that finding the truth won't be easy, especially when he turns out to be as artless as her, and more compelling and dangerous than books.