When a tortured spy meets a wallflower with hidden strength, passion and suspense ignite in this hot Regency romance from USA Today bestselling author Grace Callaway! He's a widower with deadly secrets. She's the virgin who sees past his scars. Sometimes love is the most dangerous mission. "It had me captivated from the beginning with a hot alpha and dark sensual promises, all mixed in with romance and a gripping mystery." —Nicola, Goodreads M is for Marquess Gabriel Ridgley, the Marquess of Tremont, is dubbed The Angel for his pristine reputation—but he harbors deadly secrets from his days as an agent for the Crown. When he meets Miss Dorothea Kent, a lady with a frail constitution but fierce spirit, he's torn between carnal desire and the need to protect her from his dark past. When fate places his disabled son in Thea's care, she's determined to guard the boy and unravel Gabriel's mysteries. But someone is killing Gabriel's former colleagues, and Gabriel is next on the list. As the hunter becomes the hunted, the only salvation lies in trust...and love. "Gabriel and Thea from this book were two of the best characters I read this year." —Romantic Historical Reviews Grace Callaway writes hot and heart-melting historical romances packed with steam, swoon, and suspense. Perfect for fans of Bridgerton, Lisa Kleypas, and Amanda Quick. Grace's standalone novels can be enjoyed individually or as part of the irresistibly interconnected Callawayverse. Heart of Enquiry (The Kents) series (hot Regency romance) Prequel Novella: The Widow Vanishes (Will & Annabel) 1. The Duke Who Knew Too Much (Alaric & Emma) 2. M is for Marquess (Gabriel & Thea) 3. The Lady Who Came in from the Cold (Marcus & Penny) 4. The Viscount Always Knocks Twice (Richard & Violet) 5. Never Say Never to an Earl (Sinjin & Polly) 6. The Gentleman Who Loved Me (Andrew & Primrose) Don't miss the sizzling series in the Callawayverse (in chronological order): – Mayhem in Mayfair – Heart of Enquiry (Kents) (this book belongs to this series) – Game of Dukes – Lady Charlotte's Society of Angels – Blackwood Legacy