Watchtowers every kilometer housed not soldiers guarding the wall but the night shift of engineers and technicians watching over the sluices and pumping stations. To be sure, if the sea ever broke through, it would raze the city more mercilessly than any army.

But the sea was calm this summer night, dotted with colored navigation lights, red, green, white, and the distant moving twinkle of ships' running lights. The eastern horizon glowed faintly, false dawn from the radiant cities of Europe beyond the waters. On the other side of the white barrier toward ancient London, all the dirt and grime and broken places were swallowed by the night, leaving only the jewelled illusion of something magic, unmarred and immortal.

Miles pressed his face to the aircar's bubble canopy for a last strategic view of the arena they were about to enter before the car dropped toward the near-empty parking area behind the Barrier. Section Six was peripheral to the main channel sections with their enormous navigation locks busy around the clock; it was just dike and auxiliary pumping stations, nearly deserted at this hour. That suited Miles. If the situation devolved into some sort of shooting war, the fewer civilian bystanders wandering through the better. Catwalks and ladders ran to access ports in the structure, geometric black accents on the whiteness; spidery railings marked walkways, some broad and public, some narrow, reserved no doubt to Authorized Personnel. At present they all appeared deserted. No sign of Galen or Mark. No sign of Ivan.

"What's significant about 0207?" Miles wondered aloud. "I have the feeling it should be obvious. It's such an exact time."

Elli the space-born shook her head, but the Dendarii soldier piloting the aircar volunteered, "It's high tide, sir."

"Ah!" said Miles. He sat back, thinking furiously. "How interesting. It suggests two things. They've concealed Ivan around here someplace—and we might do best to concentrate our search below the high waterline. Could they have chained him to a railing down by the rocks or some damned thing?"

"The air patrol could make a pass and check," said Quinn.

"Yes, have them do that."

The aircar settled into a painted circle on the pavement.

Quinn and the second soldier exited first, cautiously, and ran a fast perimeter scan around the area. "There's somebody approaching on foot," the soldier reported.

"Pray it's Captain Galeni," Miles muttered, with a glance at his chrono. Seven minutes remained of his time limit.

It was a man jogging with his dog. The pair stared at the four uniformed Dendarii and arced nervously around them to the far side of the parking lot before disappearing through the bushes softening the north end. Everybody took their hands off their stunners. Civilized town, thought Miles. You wouldn't do that at this hour in some parts of Vorbarr Sultana, unless you had a much bigger dog.

The soldier checked his infra-red. "Here comes another one."