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Travis shrugged. ‘Maybe. They’re extending the fence along the beach. They probably intend to seal us in for ever.’

‘What?’ Bridgman stood up with a sudden feeling of uneasiness. ‘Why should they? Are you sure? I mean, what would be the point?’

Travis looked up at him, a flicker of dry amusement on his bleached face. Wisps of smoke wreathed his head, curled up past the serpentine columns of the grotto to the winding interval of sky a hundred feet above. ‘Bridgman, forgive me saying so, but if you want to leave here, you should leave now. In a month’s time you won’t be able to.’

Bridgman ignored this, and searched the cleft of dark sky overhead, which framed the constellation Scorpio, as if hoping to see a reflection of the distant sea. ‘They must be crazy. How much of this fence did you see?’

‘About eight hundred yards. It won’t take them long to complete. The sections are prefabricated, about forty feet high.’ He smiled ironically at Bridgman’s discomfort. ‘Relax, Bridgman. If you do want to get out, you’ll always be able to tunnel underneath it.’

‘I don’t want to get out,’ Bridgman said coldly. ‘Damn them, Travis, they’re turning the place into a zoo. You know it won’t be the same with a fence all the way around it.’

‘A corner of Earth that is forever Mars.’ Under the high forehead, Travis’s eyes were sharp and watchful. ‘I see their point. There hasn’t been a fatal casualty now’ — he glanced at Louise Woodward, who was strolling about in the colonnades — ‘for nearly twenty years, and passenger rockets are supposed to be as safe as commuters’ trains. They’re quietly sealing off the past, Louise and I and you with it. I suppose it’s pretty considerate of them not to burn the place down with flame-throwers. The virus would be a sufficient excuse. After all, we three are probably the only reservoirs left on the planet.’ He picked up a handful of red dust and examined the fine crystals with a sombre eye. ‘Well, Bridgman, what are you going to do?’

His thoughts discharging themselves through his mind like frantic signal flares, Bridgman walked away without answering.

Behind them, Louise Woodward wandered among the deep galleries of the grotto, crooning to herself in a low voice to the sighing rhythms of the whirling sand.

The next morning they returned to the town, wading through the deep drifts of sand that lay like a fresh fall of red snow between the hotels and stores, coruscating in the brilliant sunlight. Travis and Louise Woodward made their way towards their quarters in the motels further down the beach. Bridgman searched the still, crystal air for any signs of the wardens, but the sand-car had gone, its tracks obliterated by the storm.

In his room he found their calling-card.

A huge tide of dust had flowed through the french windows and submerged the desk and bed, three feet deep against the rear wall. Outside the sand-break had been inundated, and the contours of the desert had completely altered, a few spires of obsidian marking its former perspectives like buoys on a shifting sea. Bridgman spent the morning digging out his books and equipment, dismantled the electrical system and its batteries and carried everything to the room above. He would have moved to the penthouse on the top floor, but his lights would have been visible for miles.

Settling into his new quarters, he switched on the tape-recorder, heard a short, clipped message in the brisk voice which had shouted orders at the wardens the previous evening. ‘Bridgman, this is Major Webster, deputy commandant of Cocoa Beach Reservation. On the instructions of the Anti-Viral Sub-committee of the UN General Assembly we are now building a continuous fence around the beach area. On completion no further egress will be allowed, and anyone escaping will be immediately returned to the reservation. Give yourself up now, Bridgman, before—’

Bridgman stopped the tape, then reversed the spool and erased the message, staring angrily at the instrument. Unable to settle down to the task of rewiring the room’s circuits, he paced about, fiddling with the architectural drawings propped against the wall. He felt restless and hyper-excited, perhaps because he had been trying to repress, not very successfully, precisely those doubts of which Webster had now reminded him.

He stepped on to the balcony and looked out over the desert, at the red dunes rolling to the windows directly below. For the fourth time he had moved up a floor, and the sequence of identical rooms he had occupied were like displaced images of himself seen through a prism. Their common focus, that elusive final definition of himself which he had sought for so long, still remained to be found. Timelessly the sand swept towards him, its shifting contours, approximating more closely than any other landscape he had found to complete psychic zero, enveloping his past failures and uncertainties, masking them in its enigmatic canopy.

Bridgman watched the red sand flicker and fluoresce in the steepening sunlight. He would never see Mars now, and redress the implicit failure of talent, but a workable replica of the planet was contained within the beach area.

Several million tons of the Martian top-soil had been ferried in as ballast some fifty years earlier, when it was feared that the continuous firing of planetary probes and space vehicles, and the transportation of bulk stores and equipment to Mars would fractionally lower the gravitational mass of the Earth and bring it into tighter orbit around the Sun. Although the distance involved would be little more than a few millimetres, and barely raise the temperature of the atmosphere, its cumulative effects over an extended period might have resulted in a loss into space of the tenuous layers of the outer atmosphere, and of the radiological veil which alone made the biosphere habitable.

Over a twenty-year period a fleet of large freighters had shuttled to and from Mars, dumping the ballast into the sea near the landing grounds of Cape Canaveral. Simultaneously the Russians were filling in a small section of the Caspian Sea. The intention had been that the ballast should be swallowed by the Atlantic and Caspian waters, but all too soon it was found that the microbiological analysis of the sand had been inadequate.

At the Martian polar caps, where the original water vapour in the atmosphere had condensed, a residue of ancient organic matter formed the top-soil, a fine sandy loess containing the fossilized spores of the giant lichens and mosses which had been the last living organisms on the planet millions of years earlier. Embedded in these spores were the crystal lattices of the viruses which had once preyed on the plants, and traces of these were carried back to Earth with the Canaveral and Caspian ballast.

A few years afterwards a drastic increase in a wide range of plant diseases was noticed in the southern states of America and in the Kazakhstan and Turkmenistan republics of the Soviet Union. All over Florida there were outbreaks of blight and mosaic disease, orange plantations withered and died, stunted palms split by the roadside like dried banana skins, saw grass stiffened into paper spears in the summer heat. Within a few years the entire peninsula was transformed into a desert. The swampy jungles of the Everglades became bleached and dry, the rivers cracked husks strewn with the gleaming skeletons of crocodiles and birds, the forests petrified.

The former launching-ground at Canaveral was closed, and shortly afterwards the Cocoa Beach resorts were sealed off and evacuated, billions of dollars of real estate were abandoned to the virus. Fortunately never virulent to animal hosts, its influence was confined to within a small radius of the original loess which had borne it, unless ingested by the human organism, when it symbioted with the bacteria in the gut flora, benign and unknown to the host, but devastating to vegetation thousands of miles from Canaveral if returned to the soil.