Untouched by time and bonded with the witch, Rowan, the ancient tree of knowledge hides on a mysterious island off the coast of Maine. As Rowan's powers wane, the tree sends out tendrils of energy to search for its new guardian.

Willow escapes the confines of the commune where she grew up, and searches for a place to belong. Not understanding the mystical force guiding her, she travels until she discovers Woodlight, a settlement hidden in the forests north of Camden. There, she discovers her magickal powers and a birthright that involves battling Lucian, a sorcerer intent on claiming the tree's knowledge. Willow's growing attraction to the powerful druid, Thane, complicates the situation and distracts her attempts to access her magick.

While Rowan's powers continue to falter and the sorcerer, Lucian, draws closer, they discover an adversary from Rowan's past is killing witches, burning their trees, and kidnapping their daughters. Darkness hovers over Willow and those she comes to care for, and time is running out. She needs to learn how to wield her powers if she is to bond with the tree.

Is Willow strong enough to embrace her destiny? Can Rowan finally defeat her nemesis? After centuries of being protected by witches, will the tree finally fall to Lucian's grasp?