The first book of the Dukes of War series by Erica Ridley, “The Earl’s Defiant Wallflower 
A drama-comedy novella, “The Earl’s Defiant Wallflower
It’s an interesting premise to say the least. And you will fall in love with Grace and Oliver as they fall in love with each other.
“The Earl’s Defiant Wallflower
Oliver York returns from war to find his father dead, his finances in arrears, and himself the new Earl of Carlisle. If he doesn’t marry an heiress—and fast!—he and his tenants are going to be pitching tents down by the Thames. He definitely shouldn’t be trading kisses with a penniless debutante… no matter how captivating she is!
Miss Grace Halton is in England just long enough to satisfy the terms of her dowry. But a marriage of convenience isn’t as easy as she’d hoped. Back in America, her ailing mother needs medicine only Grace’s dowry can afford. Which means the dashing earl she can’t get out of her mind is the one man she can’t let into her heart.
