Almost a Bride by Gayle Callen

Roselyn Harrington ran from her arranged wedding to Spencer Thornton and into the arms of a man she thought loved her. Years later, when a wounded Thornton washes ashore on her island, his presence threatens her in more ways than one.
Spencer lies helpless, knowing that a Spanish spy plans to accuse him of treason—or kill him. He must return to London, but how can he leave, when his anger over Roselyn’s betrayal is rapidly becoming passion?
(This book was previously published as His Betrothed.)