They need. They seed. They breed.

An inhuman evil lurks in the depths of Lake Washington - an evil that walks among us. They look like us...they talk like us...but they are not us. And when Cassidy Jones discovers that they threaten life as we know it, can she summon the power to stop them? In her greatest test yet - and her greatest adventure - the world hangs in the balance against a relentless and insidious adversary: the Luminous.