Greg just managed the climb down the ladder, frightened his weak, trembling hands were going to lose their grip. He flopped down in the bottom of a hovercraft, exhausted and horribly woozy.

Gabriel sat on a bench next to him, breathing heavily. One of the crewmen cuffed them both again.

"Are you all right?" Gabriel asked, her face anxious.

"Yeah."

He heard the fan start up, an incessant droning whine. There was a surge of motion, then the deck tilted up as they climbed the levee wall. The dizziness returned.

When they were down the other side, he struggled into a sitting position against the tough plastic of the gunwale, trying to take an interest in the journey. The sour-faced woman was perched on the rear bench, her waterproof zippered up against the occasional scythe of spray. Her hair was blowing about in the slipstream.

One of the Mirriam's crewmen was up front, steering from behind a little Perspex windshield. A bodyguard was sitting behind him, giving Greg and Gabriel the occasional impersonal glance. At least Toby wasn't on board. He managed to get his eyes above the gunwale.

It'd taken centuries to drain the original fenland marches and turn them into farmland; generations had laboured to liberate the rich black loam from the water, rewarded with the most fertile soil in Europe. The polar melt drowned them in eighteen months. The Fens basin wasn't a sea, it was mud, tens of metres thick with a tackiness gradient that varied from a few centimetres of weed-clogged salt water on the surface down to near-solid treacle.

An ex-Fenman living in Oakham had once told Greg that it was possible to tell the age of a Fens house by looking at its doorstep. The older it was the more the loam would've dried out and contracted beneath it, leaving the doorstep high and dry. Really ancient cottages had a gap below the bottom of the stone and the ground.

Greg couldn't see any doorsteps; on the few lonely farmhouses still visible he was hard pushed even to see the doors.

Twelve years of sluggish tidal suction had chewed out their foundations, pulling them down into the absorptive alluvial quagmire. Some of the sturdier buildings had managed to retain their shape, upper floors rising out of the brown-glass surface over which the hovercraft were racing. But the majority had subsided into tiny flattened islands, with juncus rushes growing out of the shattered bricks and skeletal timbers. Ragged felt hems of blue-green algae encircled all of them.

The hovercraft took a gently meandering course, avoiding the solid protrusions and swollen semi-submerged branches of dead copses in wide curves. Greg and Gabriel were following Kendric's craft, slicing through the fine spray its passage whipped up. Behind them, the horizon was marked by a fine green line. The Nene levee. Which meant they were heading approximately south. It didn't make any sense to Greg. There was nothing ahead of them.