The kingdom of Fortriu has enjoyed five years of peace since Bridei came to the throne. But now Bridei is preparing for the long-awaited war that he hopes will see the Gaelic invaders driven from the west forever. Hostage princess Ana is sent north to make a strategic marriage. Her escort is led by a man she despises: the enigmatic Faolan, Bridei's assassin and spy. The expedition is ill-fated, and when Ana arrives at the chieftain Alpin's stronghold, she is uneasy. Unable to wait for word from Ana, Bridei's forces march into battle. But it is revealed to those left behind that their king heads not only towards defeat, but certain death. There is only one messenger who can reach him in time, but to enlist his services will set brother against brother, and endanger what has become dearest to Ana's heart.