This, the fourth book in the "Tom Corbett" series by "Carey Rockwell" (whoever he was in real life) -- is, like all of the "Tom Corbett" books, something special. It's another tale of the three young men who serve in the Solar Guard as Space Cadets. The Solar Guard is establishing its first colony on a star far away in space, and of course, our heroes are in on the mission. But somehow a villain named Paul Vidac has wormed his way into the Cadets' assignment -- replacing Capt. Strong as Lt. Governor. The man means nothing but evil, and if the cadets don't catch him at it, it'll be the end of them for certain. . . .