His Graceful Duchess by Hazel Linwood

“You want me to crash your sister’s wedding but what will you give me in return?”

Isadora is determined to save her sister from a forced marriage. But her only choice is to turn to the dangerous Duke of Giltburg for help… and give him anything he asks in exchange.
Cold and ruthless, Duke Evan never expected a fiery spinster to knock on his door in the dead of night with a scandalous proposal. Yet when he agrees, he already knows his price: her…
Only, crashing a wedding proves easier than keeping their marriage on paper. For his little wife is claiming not just his name but his every thought… even the darkest ones.

*If you like powerful Dukes, loving Duchesses and a marvelous depiction of the majestic Regency and Victorian era, then His Graceful Duchess is the novel for you.