A murdered opera singer. A duke drenched in her blood. For Bow Street Officer Hugh Marsden, the brutal killing is a straightforward case. Ever since his exile from polite society, the chance to arrest a high and mighty peer of the realm has never presented itself. Hugh won't snub the opportunity now. But Audrey Sinclair, the Duchess of Fournier, is certain her husband is wrongly accused, and she's determined to prove it to the arrogant Bow Street officer, even if she must employ her most peculiar ability—or perhaps curse—to guide her investigation. After all, a duchess can do as she pleases.

England. 1923. After a year away at finishing school where she learned etiquette, deportment, and the difference between a fish fork and a salad one, Kitty Worthington is eager to return home. But minutes after she and her brother Ned board the Golden Arrow, the unthinkable happens. A woman with a mysterious connection to her brother is poisoned, and the murderer can only be someone aboard the train. When Scotland Yard hones on Ned as the main suspect, Kitty sets out to investigate.

Nonna Maria has lived in Ischia, an island in the Gulf of Naples, her entire life. Recognizable by the widow's black she's worn every day for decades, she always has pasta on the stove and espresso in the pot for the neighbors who stop by to ask her advice on life and love. Everyone knows her, and she knows everyone's business. So if something goes wrong, islanders look to her, and not the local carabinieri, to find the solution.

Ex-police officer and former PI Molly Madison is starting over. After the death of her husband, she and her golden retriever, Harlow, move cross-country to California. But as charming and peaceful as the beachside town seems, she soon learns its tranquil tides hold dark secrets. On her first day in the new house, a large, slobbering Saint Berdoodle wanders in. Molly winds up taking on the responsibility of training Noodle since his owner is too busy to do the job. On one of their daily beachside walks, Noodle digs up a severed hand.

1784 London. Miss Tiffany Woodall didn’t murder her half-brother, but she did bury him in the back garden so that she could keep her cottage. Now, the confirmed spinster has to pretend to be Uriah and fulfill his duties as the Duke of Beaufort’s librarian while searching Astwell Palace for Uriah’s missing diamond pin, the only thing of value they own. Her ruse is almost up when she is discovered by Mr. Samir Lathrop, the local bookseller, who tries to save her from drowning while she's actually just washing up in a lake after burying her brother.