Dez and Jax are both in the sixth grade. Now they can be Sky Watchers, kids who patrol the sky path to school on their sky bikes. The Sky Watchers protect their schoolmates from spinners, little flat disks that have been programmed to steal bike packs and take them to the ground below. Nobody but the gang kids go below the tree line. It’s polluted down there. Hi-Lo Chapter Books for Children. This series of short novels was designed to engage a broad spectrum of struggling readers. No longer will upper-elementary students have to read material junior to their maturity and interests. Characters are age appropriate and come from diverse cultures and backgrounds. Science fiction, sports, paranormal, realistic life, historical fiction, and fantasy are just a few of the many genres. Books are no higher than a 1.5 reading level, with illustrations on every spread that support visual literacy and draw kids into the text.