"Now look!" Sandy said severely. "If we're going to enjoy this hike, we're _not_ going to talk about Brungarians or inventions or that lost missile. From now on, it will cost anyone five cents every time he breaks the rule!" The boys chuckled and agreed. But agreeing proved easier than keeping the rule. Again and again, either Tom or Bud would inadvertently drop a remark about their submarine experiments or the search in the South Atlantic. By the time they had parked in the hills and started climbing, Sandy's and Phyl's pockets were jingling with coins. "What are you going to do with it all?" Bud asked jokingly. "_Give it to us!_" snapped a strange voice. As the four young people turned with a start, they saw two men burst from the shrubbery just behind them. Both were holding guns! CHAPTER XVI THE GUNMAN'S SURPRISE Sandy and Phyl were terrified by the sudden appearance of the rough-looking pair with their drawn revolvers. Tom and Bud remained cool, eying the men warily. "What's the big idea?" Tom asked. "Shut up and hoist your mitts!" the bigger of the men snarled. As the boys obeyed, he muttered to his partner, "Keep these two punks covered, Mugs, while I take their cash!" "Right, Packy! I'll watch 'em!" Sandy and Phyl emptied their pockets. Then Packy took the boys' wallets and change. "Now turn around and march!" Packy snapped. Bud took the lead, followed by the two girls, with Tom bringing up the rear. They plodded up the brushy slope in silence for several minutes. Presently a weather-beaten cabin in a grove of trees came into view. "You intend to hold us there?" Tom asked. "You'll find out soon enough!" Packy answered. "We'll teach you to interfere with the Mirovs!" _The Mirovs!_ Like pieces of a jigsaw puzzle, the whole picture suddenly fell into place. It was clear to Tom now how the capture had been arranged. The call to the jail from Dimitri Mirov had been a hoax. Its purpose had really been to get Tom away from Enterprises--thus giving the two thugs a starting point from which to follow him. The mountain hike, organized by Bud and the girls, had played right into their hands! As Tom sized up the situation, seeking a way out, the group reached the cabin. "What are your terms for letting us go?" Tom asked their captors, stalling for time. The man named Packy gave an ugly chuckle. "None yet," he said. "We may just decide to set the cabin on fire." Sandy uttered a gasp as his words sank home. Phyl Newton had turned deathly pale. Packy now told his partner to unlock the cabin. Mugs stepped to the door. At that moment Tom caught Bud's eye. _It was now or never!_ Tom whirled and smashed a stiff handblow to Packy's wrist, knocking the gun from his hand. Bud hurled himself on Mugs. Taken off guard, the shorter thug staggered and went down under a hail of punches. Bud grabbed his wrist and twisted it mercilessly while he pinned him to the ground. Mugs screeched with pain. "C-c-cut it out!"