A mystery has occurred at Riddle Middle School, where suspended students have stolen the big mid-term exam. They threaten to give the test to everyone unless the principal drops their punishment. Instead, the principal orders the six department heads to find the culprits...or face demotion! Join forces with them as they search for the thieves and along the way take brainteasing challenge after challenge - including lateral thinking puzzles, tricky logic questions and mathematical conundrums, to capture the crooks. Of course, all the solutions are right in the back of the book, thoroughly explained.