"This forest was home to thousands, millions of life forms, a colony, a vaulted, green, cathedral-like, city. Surely she knew all this, and yet, she'd never thought of it before, never really noticed. The woods and forests were just somewhere pleasant to walk, to be surrounded by nature, in the beautiful, lush quiet. As if it was made for her, and the people like her. But it wasn't. It wasn't made for any of them."

Art journalist Lily Goodfellow is excited to have discovered a young artist with the gift to capture nature, beyond what the naked eye can see.

As she tries to unravel the secrets of North London's woods, Lily finds herself confronted by ancient forces, bent on protecting their own boundaries at all costs.