The Bastard Heir by Harper St. George

A fake engagement between an unconventional heiress and the outlaw she blackmails leads to a high-stakes game of love neither saw coming in this novel from Harper St. George’s The Gilded West series.

Consumed by vengeance and on the trail of the murderer who killed his grandfather, Castillo Jameson has no room in his life for love. Until a chance encounter on a train throws a beautiful heiress in the crossfire of his revenge, where they share a stolen kiss, never expecting to see each other again.
Caroline Hartford has aspirations that don’t include settling down into a loveless, society marriage. Her dream is to become a physician, but her parents demand she marry first. Then the dangerous outlaw from the train arrives at the wedding she’s attending, and Caroline knows she’s found the answer to her problem. She’ll keep his real identity a secret, if he’ll pretend to be her fiancé.
Against the backdrop of America’s Gilded West, Castillo’s enemies threaten to bring their precarious alliance crumbling down around them. Torn between duty and a love that could shatter them both, he’ll have to decide if he can let go of the past to embrace a future with the woman he loves.

Note: Originally published as Marriage Deal With the Outlaw. This version has been reedited and updated with new content.