Five days before her wedding to Detective Inspector Tom Mallory, Kate Hamilton finds her friend Sheila in need of her help. Sheila, a soon-to-be bride herself, needs Kate’s help to get Carl Curtis, her fiancé, out of Venezuela. His passport was taken from him by the authorities, and they say he owes them money. Carl says it’s a bribe, but he’s unable to leave unless it’s paid. Sheila decides to sell her grandfather’s coin collection, including a valuable gold coin presented by Queen Victoria to her great-grandmother. Among her grandfather’s stored possessions is a letter from the Queen.

Autumn has come and gone on Scotland’s Isle of Glenroth, and the islanders gather for the Tartan Ball, the annual end-of-tourist-season gala. Spirits are high. A recently published novel about island history has brought hordes of tourists to the small Hebridean resort community. On the guest list is American antiques dealer Kate Hamilton. Kate returns reluctantly to the island where her husband died, determined to repair her relationship with his sister, proprietor of the island’s luxe country-house hotel, famous for its connection with Bonnie Prince Charlie.

Sea Isle was supposed to be the fresh start Dr. Emilia McRoy dreamed of. Far from the busy emergency room across the Atlantic in Seattle, she hoped to settle down and begin this new chapter as a small-town doctor to the quirky residents who immediately welcomed her. When she stumbles across a dead body, she starts to think that she may not be as Scot free of the drama and intrigue as she initially thought.

After receiving unexpected inheritance from her grandfather, Mercy and her twin sister Lizzie are now the proud owners of a charming antique bookshop in the tiny Irish village of Shamrock Cove. But before they can take in the beautiful view of the sea, one of their neighbors drops dead! Mercy finds the Judge, a well-respected man who lives next door, dying on his own doorstep. She rushes to help, but with his final words, he accuses Mercy of murder! Most of their new neighbors hear his words and, with suspicion pointing at Mercy, she decides to investigate the case to clear her name.

After more than a year of laying low, Billie, Helen, Mary Alice, and Natalie are called back into action. They have enjoyed their time off, but the lack of excitement is starting to chafe: a professional killer can only take so many watercolor classes and yoga sessions without itching to strangle someone...literally. When they receive a call from the head of the elite assassin organization known as the Museum, they are ready tackle the greatest challenge of their careers.