Dave is coming into his own. He's building rockets, observing comets, designing a telephone system, and he has a job on Sundays, a paying job at the park where his dad umpires local baseball games. If Dave can save up enough money and scrounge the needed materials, he's planning to build a fancy, first-rate "crate." Life is good. Then comes murder, and Dave becomes entangled in the web. Can he and the neighborhood gang find the solution to the mystery...