buoy hung around its neck, just to make things easier for us!"
"Twenty fathoms," Rick said reflectively. "That's a lot of water. Besides, we don't know how accurate Captain Campion's guess was. We may be getting into water that's too deep for us."
Which, though unknowing, was one of the most prophetic remarks he had ever made.
CHAPTER II
The Scuba Slip
Charlotte Amalie had color. It was an old community, dating back to Danish ownership of the Virgin Islands, and there was a feeling of antiquity underneath the color of the tropics. There was no sharp lines to buildings; everything had a pleasant weathered look.
"Friendly folks," Scotty observed, after the tenth passer-by had bidden them a good day. "Doesn't seem to matter whether they're rich or poor. They look happy, and they're certainly polite."
"I like it," Rick agreed. "Those colored roofs get me." He stumbled on a cobblestone and added, "But the street could stand improving. Cobbles are fine for horses, maybe, but they're hard on cars."
"What do they do here for a living?" Scotty asked. "Wish we had Chahda along. He could reel off the straight dope from his Worrold Alm-in-ack." Their Indian friend, Chahda, was at home in Bombay and they hadn't heard from him in some time. His ability to quote from The World Almanac, which he had memorized, had caused the boys considerable amusement, even while they appreciated having a kind of walking encyclopedia with them.
They passed a fruit stand where women were shopping for mangoes, soursops, and other delicious-looking things, including sugar cane. "That's part of it," Rick said. "Sugar. This is also the headquarters for bay rum."
Scotty's eyebrows went up. "Bay rum?" He stepped out of the way to let an ancient woman on a donkey go by. "What's the bay part of it?"
Rick shrugged. "Search me. Anyway, you don't drink it, you put it on your face. I guess it was originally distilled from bayberry trees or something. Anyway – " He stopped suddenly as Scotty's fingers sank into his arm.
"Look!" Scotty exclaimed.
Rick looked, and let out a yell. "Steve! Steve Ames!" In the next moment he could have bitten his tongue out, because it was entirely possible that Steve wasn't traveling under his own identity.
Ames was an athletic-looking young man in a white suit and Panama hat. He stopped at Rick's hail, turned, and waited for the boys to catch up. His face split in a pleased grin.
Rick breathed his relief. Evidently Steve didn't mind being called by name.
The boys knew Steve as Spindrift's contact with JANIG, the Joint Army-Navy Intelligence Group for which Spindrift had worked in the past, once to solve The Whispering Box Mystery, and again to track down the secret of The Caves of Fear.
"Wonder what he's doing here?" Scotty muttered.
"We'll soon find out," Rick said.
Steve greeted them cordially. "What brings you two wanderers to these shores?"
"We were about to ask the same of you," Rick returned.
Steve grinned at the obvious curiosity in the boys' faces. "Nothing very exciting. I'm here on a little vacation. Swimming."
"What kind of swimming?" Scotty wanted to know.
"Oh, skin diving, mostly."
"Gosh, that's wonderful!" Rick exclaimed. "Scuba or snorkel?"
There was the barest of hesitations before Steve replied. "Snorkel. There's nothing that's more fun than snorkeling around the reefs. That's the only way to swim in waters like these. You can get right down among the fish."
Rick saw Scotty's mouth open to point out Steve's error, but he stepped on his friend's foot and said quickly, "We're here for the swimming, too. Maybe we can join forces."
He knew the answer would be no. Steve wasn't vacationing; he was on a case. A vacationing skin diver would know that a snorkel is nothing but a tube that allows a swimmer to float face down on the surface of the water while looking for something to dive after. Once the dive starts, the snorkel has no purpose, since its short length only allows it to project a few inches above the surface while a diver is floating face down. On the other hand, the Scuba – Self-Contained Underwater Breathing Apparatus, like the boys' aqualungs, really does allow the diver to get down among the fish.
"Thanks for the invitation," Steve said. He smiled. "I don't usually try a cover story unless I have it down cold. Just for my future guidance, where did I slip? Your faces were quite a study."
Rick told him. Steve nodded. "Thanks. I just got here on the morning plane, and I haven't been briefed yet. By tonight I'll be an expert on skin diving."
The statement only whetted further Rick's over-sharp curiosity. If Steve was to be briefed on skin diving, it sounded like a case that would interest him and Scotty.
Steve continued to smile. "I don't want to linger too long. Want to give me a hand?"
Rick refrained from shouting and merely nodded his head. Scotty, with only slightly less restraint, said, "You know we do."
"Fine. Don't look. In the doorway of the tailor shop is a dark-complexioned man in a gray sharkskin suit. He's a tail. He picked me up at the airport. I don't know the town well enough to lose him easily in broad daylight. Never been here before today. Take him out for me?"
Rick and Scotty nodded. Neither looked toward the doorway. "How will we get in touch with you?" Rick asked.
Steve hesitated. "There's no one I'd rather see more of, and no one I'd rather have on my side. But this case is not for you. Just do me this favor, then forget you saw me."
"You never know when you'll need help," Rick pointed out. "We won't horn in, but it won't do any harm to know how we can reach other. Tonight we'll be at a hotel called Alexander's Rest. Tomorrow we take off for an island called Clipper Cay."
"All right. If you really need to reach me, call the duty officer at the UDT base and leave a message. I'll get it."
Rick turned slightly. In a plate-glass window across the street he could see a reflection of the tailor shop Steve had mentioned, and he could make out the form of a man in the shadowed doorway. He estimated that the shop was about fifty feet away.
Scotty was also measuring the situation. He said, "Walk away from us so the tail will have to come by."
Steve nodded. He shook hands, gave them each a grin, and was gone.
Rick said loudly, "Give me your shoulder to lean on. I've got a rock in my shoe."
Scotty obliged, and Rick half turned as he did so. He saw the man in the gray sharkskin suit saunter out of the doorway and start toward them.
Rick balanced on one leg, one hand on Scotty's shoulder, the other hand fumbling with the shoelace on his lifted foot.
The tail walked toward them, unfolding a paper as he did so. He was apparently devoting his full attention to the paper; his actions said he didn't even know the boys existed.
"You ought to get tighter shoes," Scotty observed. "Then you wouldn't get stones in them."
"Save
