"I've been out here almost a week," the Air Intelligence officer suddenly went on, "and what little I've discovered leads me to believe that all information about our military preparations is leaving Singapore by air. No, not radio. I mean by plane. By British plane."
"A dirty rat in the R.A.F., sir?" Dave gasped as though the very thought of such a thing were a sacrilege.
"We've caught the type several times in the past," Air Vice Marshal Bostworth said grimly. "Yes, to be perfectly frank with you. I've checked and rechecked the service history of every single member of Singapore R.A.F. personnel, from the Brass Hats right down to the lowest grade aircraftsman, but a fine lot of good it's done me. I can't find a single thing that even begins to look suspicious. Yet I'm sure there are one or more Axis secret agents out here wearing the R.A.F. uniform."
The senior officer stopped to raise a silencing hand as Dave started to interrupt.
"I know that sounds crazy," he said. "I mean, that the spy is in the R.A.F. out here. But here is my reason for thinking so. Rather, my reasons for thinking so. I've made a few tests. I've let certain bits of information become known, and then used a secret gadget we've perfected that can pick up any kind of radio broadcast on any wave-length within a radius of two hundred miles. And can do it while nearby powerful stations are operating. But we didn't hear a single broadcast of which we didn't know the code and couldn't decipher easily. I've checked all ship movements, and all movements of troops going over the causeway. And all civilians, too. However, all the information I had purposely let slip reached the Berlin Government in a very short time. That was reported to me by my own agents. So I was sure all of the information left here by plane. It must have. But.... But I must confess I didn't even dream they did it the way your experience seems to prove they do it."
"Then that two hour patrol we were supposed to have made, and did make?" Dave said with a puzzled frown. "You expected us to spot the spy in his plane tearing off to pass on the information to somebody else? But maybe we might not have given him a single glance. At least, not a second glance."
Air Vice Marshal Bostworth shook his head and struck a match to fire up his dead pipe.
"No, not exactly that," he said presently. "I let out a rather valuable bit of information concerning coming reenforcements out here, and then grounded all planes. Used the excuse of general overhaul and inspection. At the same time I arranged for you chaps to buzz around over the Strait. First, I wanted to see if our little spy friend would risk it to fly off with his bit of information in the face of my grounding order. If he did, we could jolly well radio you chaps his direction and orders to head him off at all cost. Secondly, if the blighter didn't try to sneak off ... which he didn't, blast him ... I wanted you chaps out there to spot any plane of any type that might attempt to contact you in the air. In other words I was counting on you chaps to help me get a line on the other plane that I believed was flying out each day from Japanese controlled Indo-China to contact their man in our forces. I was hoping for a description of the plane, what direction it came from, and so forth. I had thought up a little stunt to pull.... But that's out, now. Our friend isn't contacting another plane. He is, of course, contacting a submarine. A Jap sub, no doubt, but I'll wager a thousand pounds it's commanded by a trained Nazi. So you see, when you didn't show up, and I found you floating on the water, I thought that you'd had a bit of a go with this supposedly other plane, and come off second best. Good lord, though, that submarine was bold as brass to surface and actually blaze away at you! To me that means they're getting very cocky. And of course I'm speaking of the Jap johnnies."
"Contacts a Jap tin can, huh, and probably drops his information by signal buoy?" Dave murmured more to himself. "The sub slips on to sea and radioes the stuff to its nearest base."
"Correct," Air Vice Marshal Bostworth said with a curt nod. "And from that particular base it is relayed on to Tokio. And from Tokio it goes to Berlin. And Hitler knows all about the very latest things we've accomplished out here. And Tokio has another bit of information on what she'll be up against when she attacks us."