thought of as being strung along a strand of DNA like beads on a spiral string. At least, that's how I visualize them. That's where I get lost so you'd better go on from there.' Lumsden smiled. 'Not bad, Mr. Jaggard; not bad at all.' He began to talk, at first hesitantly, and then more fluently.
He ranged quite widely and sometimes I had to interrupt and bring him back on to the main track. At other times I had him explain what he meant in simpler terms. The basic concepts were rather simple but I gathered that execution in the laboratory was not as easy as all that.
What it boiled down to was this. A strand of DNA contains many thousands of genes, each gene doing its own particular job such as, for instance, controlling the production of cholinesterase, a chemical which mediates electrical action in the nervous system. There are thousands of chemicals like this and each has its own gene. The molecular biologist had discovered certain enzymes which could cut up a strand of DNA into short lengths, and other enzymes which could weld the short lengths together again. They also found they could weld a short length of DNA on to a bacteriophage, which is a minute organism capable of penetrating the wall of a cell. Once inside, the genes would be uncoupled and incorporated into the DNA of the host cell. Put like that it sounds rather simple but the implications are fantastic, and Lumsden was very emphatic about this. 'You see, the genes you incorporate into a cell need not come from the same kind of animal. In this laboratory we have bacterial cultures which contain genetic material from mice. Now a bacterium is a bacterium and a mouse is a mammal, but our little chaps are part bacterium and part mammal.'
'Breaking down the seed, mingling one kind with another, creating chimaeras,' I mused. 'I suppose you could put it that way,' said Lumsden. 'I didn't put it that way,' I said. 'Mayberry did.' At that stage I didn't get the point. 'But what's the use of this?' Lumsden frowned as though I was being thick-witted, as I suppose I wa s. Penny spoke up. 'Lummy, what about Rhizobium?' His brow cleared. 'Yes, that's a good example.' He said that although plants need nitrogen for their growth they cannot take it from the air, even though air is 78 per cent nitrogen. They need it in the form of nitrates which, in man-planted cash crops, are usually spread as artificial fertilizer.
However, there is a range of plants, notably the legumes-peas, beans and so on-which harbours in its roots the Rhizobium bacterium. This organism has the power of transforming atmospheric nitrogen into a form the plant can use. 'Now,' said Lumsden. 'All plants have bacteria in their roots and some are very specific. Supposing we take the Rhizobium bacterium, isolate the gene that controls this nitrogen-changing property, and transfer it into a bacterium that is specific to wheat. Then, if it bred true, we'd have self-fertilizing wheat. In these days of world food shortages that seems to me to be a good thing to have around.' I thought so, too, but Penny said, 'It can be pretty dangerous. You have to be damned sure you've selected the right gene. Some of the Rhizobium genes are tumour- causing. If you get one of those you might find the world wheat crop dying of cancer.'
'Yes,' said Lumsden. 'We must be very sure before we let loose our laboratory-changed organisms. There was a hell of a row about that not long ago.' He stood up. 'Well, Mr. Jaggard, have you got what you wanted?' 'I think so,' I said. 'But I don't know if it's going to do me a damned bit of good. Thanks for your time, Professor.' He smiled.
'If you need more information I suggest you ask Penny.' He glanced at her. 'I suggest you take the day off, Penny. You've had a nasty shock-you don't look too well.' She shivered. 'The thought that there are people in the world who'd want to do that to you is unnerving.'
'I'll take you home,' I said quietly. 'Jack Brent can follow in your car.' She made no objection, and I turned to Lumsden. 'I suggest that any crank letters-no matter how apparently innocuous-should be forwarded to the police. And telephone calls should be reported.' 'I agree,' he said. 'I'll see to it.' So I took Penny home.
CHAPTER SEVENTEEN My relationship with Penny improved although neither of us referred to marriage. The shock of Mayberry's error had been shattering and I stuck around and helped her pick up the pieces; from then on propinquity did the rest. She was persuaded by Lumsden to stay with her work and her life took a triangular course-her home, her work, and whatever hospital Gillian happened to be in at the time.
Mayberry was thoroughly investigated, by a band of psychiatrists and by Mansell, the department's best interrogator, a soft-spoken man who could charm the birds from the trees. They all came to the same conclusion: Mayberry was exactly what he appeared to be-a nut case.
'And a bit of a coward, too,' said Mansell. 'He was going for Lumsden at first, but thought a woman would be easier to handle.' 'Why did he pick on Lumsden's crowd?' I asked. 'A natural choice. Firstly, Lumsden is very well known-he's not as averse to talking to newspaper reporters as a lot of scientists are. He gets his name in the papers.
Secondly, he hasn't been reticent about what he's been doing. If you wanted a handy geneticist Lumsden would be the first to spring to mind.' Mayberry was the deadest of dead ends. Which caused the problem Ogilvie and I had anticipated. If the acid attack had been fortuitous why should Ashton have bolted? It made no sense. Once Mayberry had been shaken down the guards were taken from Penny and Gillian, and my legmen were put to other work. Ogilvie had little enough manpower to waste and the team investigating the Ashton case was cut down to one-me, and I wasted a lot of time investigating mistaken identities.
Ashton's bolthole was well concealed. And so the weeks-and then the months-went by. Gillian was in and out of hospital and finally was able to live at home, managing on a quarter of her normal eyesight.
She and Penny were making plans to go to the United States where she would undergo plastic surgery to repair her ravaged face. Once, when I persuaded Penny to dine with me, she asked, 'What did you find in that big vault of Daddy's?' It was the first time she had shown any interest. 'Nothing.' 'You're lying.' There was an edge of anger. 'I've never lied to you, Penny,' I said soberly. 'Never once. My sins have been those of omission, not commission. I may have been guilty of suppressio veri but never suggestio falsi.' 'Your classical education is showing,' she said tartly, but she smiled as she said it, her anger appeased. 'Strange. Why should Daddy build such a thing and not use it? Perhaps he did and found it too much trouble.' 'As far as we can make out it was never used,' I said. 'All it contained was stale air and a little dust. My boss is baffled and boggled.' 'Oh, Malcolm, I wish I knew why he disappeared. It's been over three months now.' I made the usual comforting sounds and diverted her attention. Presently she said, 'Do you remember when you told me of what you really do? You mentioned someone called Lord Cregar.' 'That's right.' 'He's been seeing Lumsden.' That drew my interest. 'Has he? What about?' She shook her head. 'Lummy didn't say.' 'Was it about Mayberry?' 'Oh, no.
The first time he came was before you told us about Mayberry.' She wrinkled her brow. 'It was two or three days after you opened the vault.' 'Not two or three weeks?' 'No-it was a matter of days. Who is Lord Cregar?' 'He's pretty high in government, I believe.' I could have told her that Cregar had smuggled her father out of Russia a quarter of a century earlier, but I didn't. If Ashton had wanted his daughters to know of his Russian past he would have told them, and it wasn't up to me to blow the gaff. Besides, I couldn't blab about anything listed under Code Black; it would be dangerous for me, for Ogilvie and, possibly, Penny herself. I wasn't supposed to know about that. All the same it was curious that Cregar had been seeing Lumsden before we knew about Mayberry. Was there a connection between Ashton and Lumsden-apart from Penny-that we hadn't spotted? I caught the eye of a passing waiter and asked for the bill. As I drained my coffee cup I said, 'It's probably not important. Let's go and keep Gillian company.' Ogilvie sent for me next morning. He took an envelope, extracted a photograph, and tossed it across the desk. 'Who's that?'
He wore a heavy coat and a round fur hat, the type with flaps which can be tied down to cover the ears but which never are. Wherever he was it was snowing; there were white streaks in the picture which was obviously a time exposure. I said, 'That's George Ashton.' 'No, he isn't,' said Ogilvie. 'His name is Fyodr Koslov, and he lives in Stockholm. He has a servant, an elderly bruiser called Howell Williams.' Another photograph skimmed across the desk. I took one look at it, and said, 'That be damned for a tale. This is Benson. Where did you get these?' 'I want you to make quite sure,' said Ogilvie. He took a sheaf of photographs and fanned them out. 'As you know, we had a couple of bad pictures of Ashton and none at all of Benson. You are the only person in the department who can identify them.' Every one of the photographs showed either Ashton or Benson, and in two of them they were together. 'Positive identification,' I said flatly. 'Ashton and Benson.' Ogilvie was pleased. 'Some of our associated departments are more co-operative than others,' he remarked. 'I had the pictures of Ashton circulated. These came back from a chap called Henty in Stockholm. He seems to be quite good with a camera.' 'He's very good.'
The pictures were unposed-candid camera stuff-and very sharp. 'I hope he's been circumspect. We don't want them to bolt again.' 'You'll go to Stockholm and take up where Henty left off. He has instructions to co-operate.' I looked out at the bleak London sky and shivered. I didn't fancy Stockholm at that time of year. 'Do I contact Ashton?
Tell him about Mayberry and persuade him to come back?' Ogilvie deliberated. 'No. He's too near Russia. It
