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.

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.

Lady Emily Hardcastle is an eccentric widow with a secret past. Florence Armstrong, her maid and confidante, is an expert in martial arts. The year is 1908 and they've just moved from London to the country, hoping for a quiet life. But it is not long before Lady Hardcastle is forced out of her self-imposed retirement. There's a dead body in the woods, and the police are on the wrong scent. Lady Hardcastle makes some enquiries of her own, and it seems she knows a surprising amount about crime investigation...

When librarian Kathleen Paulson moved to Mayville Heights, Minnesota, she had no idea that two strays would nuzzle their way into her life. Owen is a tabby with a catnip addiction and Hercules is a stocky tuxedo cat who shares Kathleen's fondness for Barry Manilow. But beyond all the fur and purrs, there's something more to these felines. When murder interrupts Mayville's Music Festival, Kathleen finds herself the prime suspect.

Everyone in Athena, Mississippi, knows Charlie Harris, the good-natured librarian with a rescued Maine coon cat named Diesel that he walks on a leash. He's returned to his hometown to immerse himself in books, but soon enough he's entangled in a real-life thriller. A famous author of gory bestsellers and a former classmate of Charlie's, Godfrey Priest may be the pride of Athena, but Charlie remembers him as an arrogant, manipulative jerk—and he's not the only one. Godfrey's homecoming as a distinguished alumnus couldn't possibly go worse: by lunch, he's put a man in the hospital.