At that moment the buzzer on the Colonel's desk sounded. Switching on the inter-com. he said, 'Yes . . . All right; put him through.' Then he picked up the telephone receiver. 'Verney here. Morning, Dick. Have you rung up to let me know that your baby left last night for London?'

After listening for a full minute, he spoke again. 'I see. Damn the man! If he was going to give way at all, why the hell couldn't he do as he was asked and come up here where Special Branch have everything laid on to pinch the two of them? This is going to be very different and damnably difficult to make watertight. If L. gave us the slip and got away across the moors with the formula it would be nearly as bad as O. himself sneaking out of the country and joining the Reds. I don't think we dare risk letting them meet the way they plan to now. On the other hand, if we lay in wait and pulled L. in, unless he had already received the goods from O., we could hold him only temporarily on some minor charge. For all we know, too, he may even have a diplomatic passport and we'd have to let him go right away. In either case, he'd soon be able to agree another rendezvous with O., and if you failed to find out about it we'd be sunk. Hang on a minute. Let me think.'

There was a longish pause, then Verney went on. 'Look, Dick. You know I've every faith in you, but it wouldn't be fair to throw the whole responsibility for a thing like this on your shoulders. I shall come down myself this afternoon. When I've fixed things up this end I'll send you a signal what time to expect me.'

When he had hung up, he turned to Barney and said: 'As you will have guessed, that was Forsby. For the past few nights Lothar has been working on Otto till he's nearly driven him off his rocker. Thursday night's tape recording disclosed that he had given in and agreed to come up and meet Lothar in London today. When Forsby got that yesterday morning, he naturally expected Otto to give notification that he was going on weekend leave. He warned his boys to be ready to tail Otto and got a signal ready to send me the moment Otto left the Station. But Otto didn't leave; he sat tight. Forsby supposed that he had changed his mind and decided to dig his toes in again after all. But that wasn't the case. The explanation emerged from last night's tape recording.'