A quick glance round let him see the tower, a black phallic monolith probing a cloud-smeared night sky. The first floor's broken window was a glaring yellow rectangle, while others glowed with biolum's softer pink-white radiance; sketchy shadows were moving about inside. Several people were dashing about on the grass ring around the tower's base; three were splashing through the shallows, but not venturing far. If they wanted to get across to the reeds they'd have to get down on their bellies and squirm; it was the only way. They didn't have the motivation. A couple of intense torch beams stabbed out, scouring the reeds.

Greg rolled back on to his stomach and began his serpent wriggle again. Thirty seconds later there was hard ground under his elbows. Reeds competing with stiff blades of grass. He was using his knees as well as his elbows now, scuttling towards the gable end, and cover. He knew exactly what Kendric and Armstrong would do next. Flinty pebbles and rapier grass lacerated his skin. Somewhere over to his left another heavy body was burrowing through the vegetation.

An electromagnetic rifle opened up, warbling loudly. Bullets thudded into the mound, pinged against the brickwork, ricocheted off, whining. Greg kept going.

"Get over there." That was Kendric's unmistakably enraged voice. Murmurs of argument followed.

The white torchlight trimmed the tips of the reeds around Greg. Tiny reddish-brown ovate flowers glowed lambently. Midges formed a silver galaxy overhead. The light passed on. The electromagnetic rifle had fallen silent.

Greg reached the sloping brickwork. Gabriel was ahead of him, panting heavily at the end of a streaky mud trail.

"God, the smell," she exclaimed.

"What smell?"

"Some people."

He climbed gingerly to his feet. The island they were on was about twenty metres at its widest. Greg had cherished a half-notion that the mounds would all be connected. But the next one was a good forty metres away. Algae-curdled water sloshed like crude oil between the two. It didn't look as though there was much of it on top of the mud.

"Clothes off," Greg said, then flinched as the electromagnetic rifle poured another fusillade of bullets into the gable end.

"Do what?" Gabriel asked. She was cradling her left hand again. Her face was haggard, totally lethargic.

"We've got a lot of swimming to do. Clothes are going to drag us under."

"Swim where?"

"Clear of the tower, remember? Kilometre at least. How long have we got?"

Gabriel closed her eyes. "About twenty minutes, maybe less."

"Do we survive?"

"Some of us do, some of us don't." She sounded completely disinterested.

Greg ducked his head round the side of the bricks, bringing it back fast. "Bugger!"

"Now what?"

"They've put the fire out. I was hoping it would be a beacon to the ships on the Nene. Somebody might report it."