Year of the Fox by Ava Devlin

Hannah Lazarus has failed to thrive.
Two years as a debutante, and she fits nowhere: too bold for the ballroom, too restless in synagogue, and too quick-witted for men who only want a docile wife. Her mother insists it’s time to choose a future before she is left behind entirely. But Hannah can’t stop remembering the man who once defended her honor with a single, brutal punch—and who’s haunted her ever since.

Thaddeus Beck doesn’t believe in happily ever after.
Orphaned young, scarred inside and out, Beck built his fortune with ruthless discipline and a refusal to need anyone. He’s a man of reputation, rules, and restraint. He has no business longing for the bright-eyed debutante from a world of wealth and refinement, even if she did once look at him as though he were a hero. He knows he’s nothing of the sort.