Faro’s Daughter (English, Paperback, Georgette Heyer)

Renowned gamester and the first to admit that he is entirely void of a romantic disposition, Max Ravenscar regards all eligible females with indifference and unconcern.

But when he meets the woman his young cousin Adrian is bent on marrying – the beautiful Deborah Grantham, mistress of her aunt’s gaming house – he finds that none of his experience in risk and gambling has prepared him for such a worthy opponent.
Source- Goodreads.com

A1