Security specialist Sophie Ang goes "off the grid" into the remote valley of Kalalau on Kaua`i, where she stumbles across the disappearance of a young boy. As she races against time to save him, uncovering ugly secrets hidden in the heart of the jungle, the events she tried to flee on Oahu gather momentum. Special Agent Marcella Scott straps on her heels and wades in to help deal with what the cyber vigilante the Ghost has left behind, and trying to clear Sophie from a murder charge.