A page-turning mystery brimming with lighthearted intrigue and essential middle-grade math skills, Math Mysteries: The Fall Festival Fiasco by author Aaron Starmer will have readers on the edge of their seats as they unravel the who-done it using math. Perfect for both mystery and math lovers, as well as kids who love puzzles, riddles, brainteasers, and adventure stories! Autumn has arrived and the fourth graders at Arthimos Elementary couldn't be more excited for the Fall Festival! But when the tickets go missing, the pie eating contest is sabotoged, and a suspiciously humongous pumpkin shows up, will anyone be able to save the day and catch the culprit? The school's best (and only) investigators are on the case, The Prime Detectives—Abby “the Abacus” Feldstein, Cameron “Cam” McGill, and Gabriel “Gabe” Kim. Using arithmetic, geometry, and logic, the Prime Detectives will stop at nothing to figure out who did what, when, and why! Contains multiple, interlinked mysteries that readers help solve using math. Includes answers showing step-by-step solutions.