This, the sixth 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 Titan crystal freight contracts are up for bid, and the powers that be have decided to put the contracts out competitively to the folks who can deliver fastest - and of course there's fishy business underway. Not only are folks attempting to chea