Young CAM Jansen and the 100th Day of School Mystery

It's the 100th day of school and Cam and her classmates are celebrating. They are supposed to have pretzels, popcorn, pineapple juice, and pizza at their party--but someone has pilfered the pizza! Will Cam find the pizzas before the thief eats them?
Cam Jansen and her best friend, Eric, are excited about their class's 100th day of school party! To celebrate, they're having snacks that start with the letter P: pretzels, popcorn, pineapple juice, and everybody's favorite, pizza. But when the pizza disappears from the kitchen, it's up to Cam and her photographic memory to click and solve this delicious mystery!