Secrets of the Season. Haberdashers Tales, #4

Harry Bobbins has been the right hand man of Robert Bittlesworth for better than a decade. First in his hometown of Truro, unwittingly assisting a Home Office investigation. Then in London, as Robert's official butler and unofficial enforcer. Now he undertakes confidential investigations while his employer is overseas, and that means keeping his network of informants active. Miss Davies is an excellent informant, which is a much better thing to focus on than how distractingly attractive she is. Lily Davies still remembers the first time she saw Bobbins.
She'd knocked on the door to ask after the laundry, and he'd towered over her like Poseiden risen from the sea, shirt sleeves turned up and brows lowered in suspicion. Butlers are intimidating by nature, but usually by dint of personality and station rather than sheer physical brawn. However, she'd found his rare smiles far too likable, and he'd done her too great a service for her to ever repay. Yet now she must turn to him again in the hopes he will do her another favor.