‘It’s an artificially cultivated virus which bears a strong resemblance to one of our own viruses called Vorar D. It was originally developed as a defoliant for Vietnam, but since then it’s been taken through several different variants. It has the same effect as powdery mildew – it arrests photosynthesis in growing plants – but it also causes very rapid decay and breakdown of the cells. It’s aerobic – which means that it’s transmitted through the air – and it’s not very easy to kill.’

‘I thought you said we could clear most of it away.’

‘I did. The Pentagon already have a formula for sterilising crops that have been infected by Vorar D, and they’re pretty sure they can adapt it to clear away this particular variety. The only problem is that it’s going to take some time.’

‘I see,’ said Shearson.

There was a lengthy silence. Then Professor Protter said, ‘You don’t sound as if you’re particularly pleased.’

‘Pleased? Of course I’m pleased,’ said Shearson.

‘Then what will you do? Will you call the president, and get the authorisation for the sterilising compound to be manufactured right away? Or what?’

‘I hope you’re not trying to dictate my course of action. Professor,’ said Shearson, testily. ‘I need to see a written report on this Vorar D before I can advise the president. And what do we know about this sterilising compound? Federal restrictions are very tight on what we can spray on our crops and what we can’t. Supposing it has dangerous side-effects? Supposing it pollutes water? Supposing it can cause malformation in unborn children?’

‘It’s been thoroughly tested,’ said Professor Protter. ‘Maybe it has, but you’re talking about a variant of it. Come on. Professor, the lives and safety of millions of Americans are at stake here. You can’t treat them like guinea-pigs in one of your laboratories.’

‘Senator-it will take weeks to produce sufficient supplies of sterilising compounds and even longer to spray them over all the affected areas. If we don’t set something in motion now, we may be too late. That’s if we’re not too late already.’

Billy arrived with a half-pint silver tankard of cold champagne, which he set down beside Shearson’s telephone. Shearson snapped his fingers at him to bring him a taper for his cigar.

‘What I want you to do. Professor—’ said Shearson, puffing at his cigar again, ‘—what I want you to do is prepare me a complete file on what you’ve discovered so far. Then, when I come back from Kansas on Monday morning. I’ll call a special meeting of the Agriculture Committee, and we can discuss what action we’re going to take.’

‘But Senator—’

‘Don’t “but Senator” me, Professor. Just do what you’re told.’