The Greening: At the Root — Constance Sprague

In the vast shadowy reaches of the Pacific Northwest forest, Shiloh Carter's father has vanished.

When official search efforts fail, Shiloh leaves everything behind to find her father. But after she infiltrates the eco-terrorist group that kidnapped him, she discovers that their power is rooted in another world where ancient magic still thrives, just around the cosmic corner from Earth. To rescue her father, Shiloh is forced to develop power of her own, and fast, because when dangerous magic gets loose on Earth she learns that the kidnappers were only pawns in a much larger game.

As the Earth staggers toward chaos, Shiloh fights to save her father and stop the spread of toxic magic tangled "At The Root."