England, 1926. Just days before Lord Darriby-Jones is scheduled to enlighten the world at the Annual Limacology Symposium, his secretary unceremoniously bids adieu to her employment. It's now up to Lady Darriby-Jones to find a replacement. In a twist of fate, she stumbles upon a commoner from a neighboring town willing to accept the role, despite the slug-dismantling duties that await him. He's positively thrilled at the chance to rub elbows with true aristocrats, even if his job involves less glamorous endeavors.

1915, London: Working in the dusty bookshop that her Aunt Violet mysteriously inherited, Hannah Merrill is accustomed to finding twists in every tale. But discovering her beloved best friend Lily-Anne – with a paperknife through her heart – in the middle of the bookshop, is not a plotline she saw coming. The case is anything but textbook. With the discovery of a coded German message, and Hannah’s instinct that Lily-Anne’s husband is keeping secrets, she determines to get to the bottom of it. She can’t do it alone though.

England, 1925. After years shut away from the world, former detective Lord Edgington of Cranley Hall plans a grand ball to celebrate his seventy-fifth 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.

Cressida Fawcett is heading to the English countryside for a weekend of cocktails and partying at her friend’s glamorous mansion, the location of a recent diamond heist. But just hours after her arrival, Cressida is woken by an almighty scream. Rushing to the landing, she looks down into the great hall to find a trembling maid standing next to the body of Harry, the friendly young chandelier cleaner. Everyone believes Harry’s death was an accident. But as Cressida examines the opulent hall and the beautiful grounds, she thinks something darker is afoot.

1929: Miss Clara Vale is a woman ahead of her time. Rather than attending Oxford to bag an eligible Duke (as her mother, Lady Vale, so desperately hoped), she threw herself into a degree in chemistry, with aspirations to become a scientist in her own right. But the world isn't ready for Clara. Unable to land a job in science because she's a woman, she is stuck behind the desk at a dingy London library. Until her estranged Uncle dies suddenly, leaving her his private detective agency, and laboratory, in his will.

December 1899. After the death of her beloved grandmother, Cleopatra Fox moves into the luxury hotel owned by her estranged uncle in the hopes of putting hardship and loneliness behind her. But the poisoning of a guest on Christmas eve throws her new life, and the hotel, into chaos. Cleo quickly realizes no one can be trusted, not Scotland Yard and especially not the hotel’s charming assistant manager.

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.

If one more person gives Rosemary Lillywhite unwanted advice on when to stop mourning the loss of her beloved husband, she fears she will lose control of her sensibilities. All she wants is to be left alone to drown her misery in a glass of gin and tonic, but when Grace Barton knocks on the door of her dead husband’s investigative office, Rosemary faces a choice: come out of hiding, or turn away someone in need of help.

With only days left until Christmas, uncle Albert is in a tizzy. The annual Twelve-Birds-Of-Christmas Dinner is looming, and his scheme to procure a copy of the latest book craze to sweep the Royal Society for Natural History Appreciation has been thwarted. Now, in a desperate bid to secure a Christmas miracle, Lady Caroline and Uncle Albert travel to an isolated castle on the Yorkshire moors in pursuit of the only available copy of the coveted book.

Miss Busby helped Major Heathcliff Lennox solve a series of murders at Bloxford in the Cotswolds. Now, she finds herself drawn into a new murder, but this time, it's just her, and she must rely on her sharp mind and sharper wits to catch a Cotswolds killer, along with a handsome police inspector and a reporter who's keen to make her mark.