Bestselling team Robert Munsch and Michael Martchenko create another wacky adventure about a boy named Matthew who makes the most realistic sand castles ever! While on vacation. Matthew is excited to take part in the local sand castle contest. The winner gets a bathtub filled with ice cream! But Matthew is just too good at building sand castles. The judges all think the house he builds, complete with sand chairs, a sand refrigerator, and sand food is real! He has to prove that it's all just a big pile of sand so he can win that ice cream!