Marcus Jones is thrilled when his teacher announces there is going to be a model contest at school. Marcus and his father build models regularly at home in his dad's work room.. But when he learns that the rules say his dad can't help, his friends, Charlotte, Sally, Aaron, and Gavin, also known as the Number Investigators come to the rescue to help. Now, let's just hope his dad doesn't see the big paint spill in his work room/