For monster sleuths Tank and Fizz, proving fourth-grade bully Rizzo Rawlins is planning to cheat in the upcoming Battle Bot Cup should be a piece of cake. But cake crumbles fast, and the case soon leads the detectives to a mysterious hacker known only as the Codex, who threatens all of Rockfall Mountain with a very dark fate. With the help of their wizard-in-training partner, Aleetha, Tank and Fizz leap into action, dodging deadly battle bots and sinister spellbooks in a race to stop the return of a very angry ancient demon.<br><br>Fans of the first book, <i>Tank &amp; Fizz: The Case of the Slime Stampede</i>, will blow their circuits with this gadget- and magic-filled robot mystery. For more information about the series, visit<a href='http://www.tankandfizz.com'>www.tankandfizz.com</a>.