Tom Swift and the Electronic Hydrolung
"Who on earth could have fired it?" Sandy asked.
Tom shrugged. "No telling--yet. There's more than one unfriendly country which would give a lot for the data picked up on our Jupiter shot."
"You aren't expecting more trouble, are you?" Phyl put in uneasily.
Tom passed the question off lightly in order not to alarm his mother and the two girls. But inwardly he was none too sure of what his survey expedition might encounter in trying to locate the lost probe missile.
Ever since his first adventure in his Flying Lab, the youthful inventor had been involved in many daring exploits and thrilling situations. Time and again, Tom had had to combat enemy spies and vicious plotters bent on stealing the Swifts' scientific secrets.
His research projects had taken him far into outer space and into the depths of the ocean. With his atomic earth blaster, Tom ha