The Marquess Wins a Wife by Aydra Richards

Determined to find the man who ruined her sister and force him into matrimony at the point of a pistol, Lizzie Talbot hatches a plan to abduct the blackguard responsible. A plan which might have gone perfectly—had she not abducted the wrong man, and then shot him besides. With three siblings to support in a derelict manor house crumbling around them, and a wounded marquess to nurse back to health, will there be no end to her troubles?
Forced to rusticate in the countryside, Lucas Godwin, Marquess of Ashworth, can think only of enacting his vengeance upon the murderous harpy responsible for it. At least until Lizzie Talbot and her brood of unruly siblings begin to grow upon him, bringing a man long dead slowly back to life.
When Luke offers her a bargain—become his marchioness in exchange for his protection and support—Lizzie knows she must accept to secure her family’s future. But the man he is in London is so far removed from the man she thought she had known. Can there be any hope of warming her husband’s cold heart?