12. Of Slain Kings on Checkered Fields (2003)

X Middle School's best hope to break a losing streak is Checkmatey, a flamboyant rapper who is X's finest chess player. However, Checkmatey is kidnapped before the championship match, and multiple suspects possess a suitable motive for the crime. Fillmore and Ingrid are on the case—but the clock is ticking down and Checkmatey is nowhere to be found.

Release date: 2003-05-10