Cam Jansen and her best friend, Eric, are excited about their classOs 100th day of school party! To celebrate, theyOre having snacks that start with the letter PNpretzels, popcorn, pineapple juice, and everybodyOs favorite, pizza. But when the pizza disappears from the kitchen, itOs up to Cam and her photographic memory to OclickO and solve this delicious mystery!