His Not-So-Sweet Marchioness by Sorcha Mowbray

He’s shrouded in shame, fighting with his demons in the shadows. Until she sets her sights on him…

Mrs. Rosalind Smith once followed her heart and love to the battlefield and left a widow. Spending the remainder of her life alone is enough… until she meets a man who’s need for pain sparks an answering flame deep within her soul.
Matthew Derby, the Marquess of Flintshire is a fighter, it is all he’s known since childhood. Throwing his fists is the only way to keep his need for pain at bay, and a certain gentle woman off his mind. She deserves a better man than him–Lord or not. Though when faced with the prospect of losing Ros, Flint realizes he has found something to fight for…something to live for.
To Ros’ dismay, everyone around her believes her demeanor too sweet for someone like Flint. When his world begins to unravel and his dockside violence bleeds into the drawing room, a shocking family secret won’t be the key to all the answers. Questions remain, can he solve the mystery, tame his dark needs, and still win Ros’ heart?