Earth has been saved from the TechPsychers and now Akarn has only one thing on his mind. Revenge for his incarceration on Krakol.He and Ifor, after leaving the rest of the Psychic Knights behind, follow a lead that takes them to Fallon, a planet at the very edge of the galaxy. Not only do they find Ludo Maruda, the object of Akarn's revenge, but a mysterious machine that threatens to take the two to the brink of insanity and rob Akarn of the one thing that would bring him peace in his life. Revenge is the third book of six in the Psychic Knights series.