Mike Danford and Josh Roberts are finally back in their high school science class after taking a couple months off to investigate strange signals from deep in the earth. But now there are strange signals coming from space, and once again their special skills are needed. Admiral Norton is being very secretive about the new mission - he won’t even tell the boys where they’re going as they take a Mach 3 flight. Once they arrive, and learn the truth, they understand why. And then they wish they could be safe and sound back in their high school classroom. Safe and sound is not in their stars, though, and before they know it, Mike, Josh, and all their friends and family are once again working at breakneck speed to overcome impossible challenges and save lives. At least now they’ve been through it enough to know that they can’t succeed without the guidance of their parents, the help of their friends, and the blessings of their God. Since all of Mike's and Josh's adventures build on the ones before them, this series is best read in the order written.