"Minus five, four, three, two, one--_zero!_"

The spaceship _Good Company_ shot away from the small moon of Mars and
thousands of eyes at the spaceport followed it into the heavens,
watching its blazing track disappear into the depths of space. If
sympathy and good wishes could decide the race to Titan, the spaceship
_Good Company_ was a certain winner.

Aboard the sleek craft, Tom Corbett relaxed after the tremendous
blast-off acceleration and turned to look at the tense face of Kit
Barnard who was seated in the pilot's chair.

"Why don't you get some sleep, Kit?" said Tom. "I can take this baby
over. It's the least I can do for all you've done for _me_."

"Thanks, Tom, but I'll stay with it awhile longer," replied the veteran
spaceman. "At least until we find out where the _Space Knight_ is."

Tom suddenly remembered the trouble with Roger.

"Has there been any news of them at all?" he asked.

"The last thing we heard was that he was approaching Ganymede. And that
was a few hours ago, when you were trapped in the air-lock chamber."

"Ganymede!" Tom was thunderstruck. "But--but--how did he do it?"

Kit shook his head. "I don't know, Tom, but he sure has some speed in
that black ship of his."