The bride thief

After her father is executed for being a traitor, Isabelle is taken in by her tyrannical uncle, who confiscates her fortune. Every day she is abused by her evil cousin. Her only saving grace is her talent for accounting. All her life she thought she was too unattractive and too low of a status to get married…yet she’d always desired Sir Justin. One night Sir Justin, who had come to propose to her cousin, kidnaps her instead. He takes her to a monastery and asks her to marry him. Is this some kind of dream? What is his motive?