The Tortured King. The Man in Black, #4

Slip into Celtic prehistory with this romantic, time-travel, thriller. When a feisty archaeological gets trapped in Iron Age Ireland, a Wicca priest/goth magician demands that the Ancient Horned God take him back through time to rescue her. The Horned God can deny the magician nothing but states the rules: You cannot change history or develop bonds with anyone. To alter time can create a paradox. But how can Sorcha survive this prehistoric warrior culture without breaking rules? Assuming she's fey, the destined king's unscrupulous rival wants her power, and his lover, the wicked Crow Queen, wants her dead.
Can Estrada use his Wiccan powers and magician's skills to defeat Iron Age Druids and bring his friends home without changing history? A spin-off of Book 2, The Tortured King tells the story of a bog body discovered in the Irish midlands in 2003. Old Croghan is thought to be a deposed king who was ritually murdered. This book gives his life and death meaning.