Runaway Princess Bride

The stranger who helps Riley Jones escape her wedding is a prince, and their meeting was arranged. Prince Xander Thorne had been looking for Riley because she is the key to saving his kingdom, and he says nothing about it while she takes him for a vagrant who happened to be there. Riley was marrying Corbin Hicks to settle her parents' gambling debts, and she ran on the wedding day after he tried to force himself on her. She had been raised by people who were not her family and taught to steal. Her parents had been arranging to sell her. As she works out who her birth family was, she finds that Xander's brother, the crown prince, has been keeping things from both of them.