Bo Tanner and Mark Cooper anticipate a summer of fun when renegades escaping from a magical world burst through a dimensional hole in the sky. Cosmic Hunters are in hot pursuit but the biggest danger to Earth is in the air itself. Unstable magical atoms set off a chain reaction that begins to change Earth. Can Bo and Mark learn to use magic before the renegades find them? Or will they lose Bo's 5-year old sister to the Renegade leader, Dragen?