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X Middle School's best hope to break a losing streak in the chess tournament is Checkmatey, a flamboyant rapper who is X's finest chess player. Unfortunately, somebody is out to get him - is it Tyson Pelarez, leader of the Society of the Preservation of Ethics in Chess? Or is it Nelson Kelloch, Checkmatey's biggest rival? Fillmore and Ingrid are on the case - but the clock is ticking down to the championship match and Checkmatey is nowhere to be found...
Parodied crimes: Attempted murder, kidnapping, gambling, and drinking