When Julianna's final mission proves more deadly than she imagined, help comes from the most unlikely of places. Raised in a castle on the remote border of England and Scotland, Lord John Stanton is the last male heir of his royal lineage. He has the responsibility to marry and carry on the family name, but a secret vow to God, after a near-fatal battle wound, could change his future from royal heir to humble servant of the church. His journey to the monastery to become a monk is interrupted when he meets a dangerous, but beautiful, woman who has plans and secrets of her own. Abandoned by her father and raised in an institution as property of the Crown, Julianna Westerfield longs to be free to pursue love and have a family of her own. Trained to be a spy and assassin, she has a chance to earn her freedom by completing this last and most dangerous assignment. Her mission to uncover a murderous plot and the identities of the Black Guard has already cost several agents their lives, and now the assassins are after her. To survive she must depend on a handsome monk and his cantankerous donkey. Was it divine intervention that caused John and Julianna's paths to cross? Can they put aside their differences and join forces to deliver stolen papers containing vital information to the king in time to save countless lives?