The Devil's Liar is the ninth in the best-selling Psychic Surveys series, that feature plot twists, compelling characters, and a mystery at its dark heart. As a young woman, Theo was confronted by the spirit of a child who had killed other children, but decided she could be of no help, shutting down all possibility of further communication. Now older and wiser, Theo comes to regret that decision and wants to make amends, involving the Psychic Surveys team in her quest.

Meanwhile, Ruby is dealing with Willow Bayliss, a child who appears to be a channel for an energy that can only be described as base. Effortlessly, she opens doors to paranormal experiences beyond even Ruby's experience. Via Willow and the child spirit, Ruby and Theo are plunged into the very depths of themselves, having to examine first their own fears and motives before they can help either. They will learn there are some devils worse than others. Devils that lie and manipulate the truth and yet, for Ruby at least, are so easy to believe....