Lexi grew up in the forest thanks to her paranoid father, who fears the magical changes emerging among humans. She's made friends with Ghillie Dhu, the ancient Green Man of the Forest, who warns her of a war between fae and humans. When two musicians and their manager arrive and hire Lexi's father for a hunting expedition, worlds collide, a magical bear attacks, and everyone is conscripted into a battle of magic versus science -- with Lexi the only one who can find the clear way home.