The Serpent Under: Treachery, Twists and Terror in Baker Street (A Sherlock Holmes Adventure, Book 6)

Holmes and Watson face treachery and danger in the latest full-length thriller by Bonnie MacBird, author of the bestselling Sherlock Holmes novel Art in the Blood. Murder, jealousy, and deceit underscore three interlocking mysteries as Holmes and Watson take on a high profile case at Windsor Castle, a boy drowned in the Serpentine, and a crusading women’s rights activist who suspects a traitor in her organisation. The cases send them into danger into locales as varied as the palace itself, a dockland cannery, an arts and crafts atelier, and a gypsy encampment. But is there peril underfoot as well – right at 221B Baker Street? The twisting, breathlessly plotted conjoined mysteries that Bonnie MacBird is known for provide a thrill ride that will delight Sherlockians worldwide. In this riveting detective fiction, Bonnie MacBird masterfully intertwines historical suspense with a traditional mystery, creating a top-notch police procedural. The Serpent Under is a pre-eminent example of crime thrillers, where every twist and turn keeps you on the edge of your seat. For fans of James Lovegrove (Sherlock Holmes), Anthony Horowitz (The Twist of a Knife), Tim Major (Sherlock Holmes and The Twelve Thefts of Christmas), Christian Klaver (The Classified Dossier), and M. K. Wiseman (Sherlock Holmes & the Ripper of Whitechapel). HarperCollins 2025