A delicious dessert has vanished, and it is up to the school's best detective to find it! Cam Jansen knows that a tricky mystery can pop up anywhere, even right in the middle of the noisy school cafeteria. When her classmate Jason eagerly opens his lunch box to enjoy his favorite treat, he makes a shocking discovery. His delicious cookie is completely gone, leaving nothing behind but a few tiny crumbs! Who would take a classmate's snack? Luckily, Cam is sitting right nearby. With a quick click her amazing photographic memory springs into action. She carefully scans the lunchroom, looking for clues and interviewing hungry suspects. Can Cam piece together the crumbly evidence and solve the case before lunch period is over? Perfect for early readers, this fun and fast-paced story proves that no puzzle is too small for a smart thinker with a great memory!