Thea's Marquis (Harlequin Regency Romance Series 2 #98)

Family meant everything to Miss Thea Kilmore, even though she never expected to have one of her own. She was happy to spend all her considerable energy seeing to the well-being of her mother, sisters and brother. Until she met Roderick, Lord Hazlewood. Rod, however, felt her interest in him was purely to further the ambitions of her not-quite-respectable relatives. And he wanted more. How much more, he wasn't sure -- until Thea put her life in danger.