"And I heard you and Scotty," Rick agreed. "All three units work fine. Have you switched them off?" Barby reached up and seemed to pat her hair slightly. "I forgot," she admitted. "Now it's off." Rick looked at Jan. "Could you hear me through Barby's phone while I was talking?" Jan shook her head. "No, I couldn't. I was listening, too. These are wonderful, Rick." He smiled his thanks. "One interesting thing, though. I should have known, but it didn't occur to me. The receivers are directional." "What's that?" Barby asked. "Directional. The antenna is a tiny coil. When it's broadside to the incoming signal, the volume is loudest, but when it's end on, the volume is much less. So, if you can't hear well, just turn sideways. Turn until the signal is loudest." Scotty took his transceiver from his pocket and examined it with pride. It was no larger than a pack of playing cards, and its sensitive microphone was incorporated right into the case. The tiny antenna was a piece of stiff steel wire only two inches long. The whole gadget fitted easily into an inside coat pocket without a noticeable bulge. Barby's rig was slightly different. The antenna ran along one edge of the plastic strip. At one end the microphone was in contact with her head just above the ear, allowing for transmission of voice by bone conduction, a new method developed by the United States Air Force. At the other end of the band a tiny speaker made similar contact. Rick had worried about the effectiveness of both mike and phone, since he had never used the types before, but the design had turned out very well. "Pretty neat if we do say so," Scotty admitted modestly. "For once I agree with you," Barby said generously. "Now what, Rick? There isn't anything more to do, is there?" "Not on these." But there was more to do along other lines. He was waiting for word from JANIG. Barby and Jan disappeared and returned in a few moments with iced drinks. The boys accepted them gratefully. It was a warm day. "How about a swim?" Scotty suggested. Rick was about to point out that they might have work to do when Joe Blake, the JANIG agent in charge at the laboratory, hailed him. Rick ran to meet the agent. "The boys on the mainland didn't turn up a thing," Blake reported. "They searched from a half mile south of the pier to a half mile north. No pram anywhere." Rick snapped his fingers. "I had a hunch they wouldn't! Okay. I'm going to take off right now and search the coast. If that pram wasn't connected with the attack on Duke and Jerry, I'll eat it." "Good luck," Blake said. "Let me know if you need any help." Rick hurried back to the porch. The JANIG scout team had reported early in the morning that the pram was gone from the pier. They had been covering the Whiteside area most of the night, searching for some sign of the pair that had attacked Rick's friends, but had turned up nothing suspicious.