Sliabh na bhFian it is called - the Mountain of Warriors. Those who dwell in its shadow live in fear of the robber band who come raiding and burning from its crags. Their leader known only as 'An Beitheach' - The Beast. Béibhinn Uí Bhriain has lost two brothers to An Beitheach. Now she seeks only to destroy his reign and bring peace to her clan and lands. But sixth century Ireland is a place of magic and duplicity, and soon Béibhinn finds herself imprisoned in An Beitheach's fortress. Can her spirit and principles remain unbroken, when An Beitheach seems determined to take not only her family and freedom, but also her honor and heart?