Scotland, 1297. In the weeks leading up to the battle of Stirling Bridge, Margaret Kerr takes up residence in Stirling to discover why the informer who has been providing Wallace and Murray with details of the English plans has become unreliable. She's accepted the undertaking at the request of James Comyn, kinsman of the deposed king of Scots. It is an important and difficult mission, for who holds Stirling Castle holds Scotland, and a battle for the castle is imminent. Margaret's loyalty is tested when her estranged husband, Roger, is killed, and she suspects James is his murderer. Now her spying role is duplicitous and doubly dangerous...