Kate has just turned 11 and is about to have the adventure of a lifetime! While out playing, she steps into a rainbow and is magically transported to another place on the planet. Everywhere she goes, she meets a child of a different nationality who tells her about their cultural beliefs about rainbows. When she finally gets home, she has quite an amazing story to share, but there are some who don't believe her. Yet in the end, the proof arrives just in time and leaves the adults in her life with dropped jaws and shocked expressions.