Who took my sandwich?

Mom prepares for Jad and Tala delicious and diverse sandwiches every morning. But... at school Jad's sandwiches disappear from his lunchbox and are replaced with other sandwiches. Jad thinks of a funny plan to discover the secret of the disappearing sandwiches, so what is this plan? And will he succeed in finding out who is replacing his sandwich at school every day? Number of pages: 23 Sizes: 22*22 cm