A local radio station is holding the Great Detective Race, and the Boxcar Children have entered the contest! They solve riddles and search all over town for clues leading to the grand prize. But when some of the clues turn out to be fake, it's clear that someone is playing unfairly! Who could be trying to ruin the race - and why?

Believing his long-absent father is missing and leaving clues behind through geocaching, Zig, thirteen, relies on his love of electronics, a garage sale GPS unit, and his best friend, Gianna, to search for answers. Kirby "Zig" Zigonski lives for the world of simple circuits, light bulbs, buzzers, and motors. Electronics are, after all, much more predictable than most people--especially his father, who he hasn't seen in over a year. When his dad's...