They had been weightless for over four years now. Ladder fields allowed them to get around where it was inconvenient to echo—bounce from the walls and surfaces—or fly, or climb on physical objects. Whenever possible, the children tried to avoid using them. That was part of the game.

Cats bounded between the children, or hid in the shadows. Birds squawked and pretended to be upset; but birds and cats always followed the children, scrambling along ladder fields or gliding free in the air.

Martin puckered his lips and whistled shrilly. Play broke off in a clatter of shouts and jeers and the children gathered, grumpy at being interrupted. The air between the pipes filled with ribbons and sheets of faint light, ladder fields intersecting, like curling thin paper floating in water.

The children formed a ball around Martin. Most were only half-dressed. Four retrieved the wet, wadded clothes.

"Time for pre-watch drill," he said. "The rest can carry on."

Martin had been elected Pan six months before. Pan was in charge of all strategic functions, the most important now being drill planning and crew training. Five previous Pans had commanded the children, beginning with Stephanie Wing Feather.

Rex Live Oak, Stephanie Wing Feather, Nguyen Mountain Lily, Jeanette Snap Dragon, Carl Phoenix, Giacomo Sicilia, David Aurora, Michael Vineyard, Hu East Wind, Kirsten Two Bites, Jacob Dead Sea, Attila Carpathia, Terry Loblolly, Alexis Baikal, Drusilla Norway, Thorkild Lax, Leo Parsifal, Nancy Flying Crow, Yueh Yellow River. These made up the Pan's drill group today; each day, he drilled with a different group. There were five groups. Once a year, the groups reshuffled. Some members with well-honed skills moved from group to group depending on the drills.

The children's skins, yellow and white, brown and black, shone with sweat. Slender and stocky, tall and short, manner not obeisant, not insolent, within the observed forms, they were family and team, forged by five long years into something his mother and father would not have recognized as a useful society, but it worked… So far.

The twenty rotated and bounced in mid-air, sliding into damp overalls, Wendys in blue, Lost Boys in red. Dressed, they followed Martin aft through the second neck, toward the third homeball. Behind them, Hans Eagle urged the others to continue the game.

Most of the children wore painted designs, chiefly on their faces and bare arms and legs, patterned after things found on Earth. The designs revealed ship family associations, also reflected in their names: Cats, Places, Birds, Gifts, Plants, Foods, twenty-one families in all. Some chose not to associate, or freelanced, as Hans did, though originally he had belonged to the Birds.

A Pan was required to be more circumspect than other children. Martin came by it naturally; he wore no designs, and had never worn paint, though he belonged in a semi-formal way to the Trees family. Behind him, bulky, strong Rex Live Oak followed with an oak leaf on each cheek; Stephanie Wing Feather carried parrot feathers in her hair; and so on, back through the ranks, climbing through the dim, close spaces of the second neck, dipping hands and toes into ladder fields. They used ladders in the neck to keep discipline before drill. The bunched-up colors of twenty ladders—personally selected shades of red, green, blue and yellow—made a dim rainbow down the neck's clear center aisle, smearing like paint poured down a gutter.

Each child carried a wand, a cylinder of steel and glass about nine inches long and two inches wide, with no buttons or visible moving parts. The wands served as monitors and communicators and gave them access to the ship's mind, the libraries, and to the moms. Nobody knew where the ship's mind or the libraries resided—nobody knew where the moms went when they were not among the children, or even how many moms there actually were.

The wormspaces this far to the rear smelled of water and exercise, but that cleared with the push of air to the ship's aft homeball. Around them, dark protrusions—round-edged cubes, lines of hemispheres, undulating conduits—reflected the light of their passage and their murmurs of conversation. There was always a steady breeze in the wormspaces, cooling and fresh.

The children's sense of smell was acute, and even slight differences in odor were apparent. They knew each other by smell as well as by sight. The children had not known colds since the first few weeks on the Ark; there was nothing in the Dawn Treaderto cause allergic reactions, except the cats and birds, and for one reason or another they did not.

Their physical health was perfect. They did not suffer ill effects from weightlessness. Minor wounds healed quickly. Wendys did not get pregnant.

For five years the children had been training and drilling, at first under the steady tutelage of the moms, then, as their social structure became solid, under their own leaders and appointed teachers. At the start of the voyage, the children had been divided into four teams: navigation, planning, crew maintenance, and search. Martin had been placed in charge of navigation and had learned the techniques of controlling ship motion.

After the first few months, however, navigation became unnecessary or routine. The Dawn Treaderwas largely self-directed, and the children all knew that much of the work was for their own benefit. Emphasis had then been switched to drill and study; Martin had become more interested in crew maintenance and the search team.

The Job they trained for was at once simple to express and almost too large to understand: if and when they located the civilization that had made the machines that destroyed Earth—the Killers—they would pass judgment and carry out the Law. The core of the Law had been translated for the children at the beginning of their training: "All intelligences responsible for or associated with the manufacture of self-replicating and destructive devices will be destroyed." The message had dug deep, expressing in stiff, cold words the hatred and need they all felt. The Law was administrated by an alliance of civilizations, the Benefactors, that built machines to search out the Killers' machines, to thwart them and destroy them, and to track down their makers.

The Law required that some of Earth's survivors partake in the hunt and the destruction. To those who killed the Earth: beware her children!

Destroying an advanced civilization was a daunting task, even with the weapons contained within the Ship of the Law. Still, it was possible for the small and relatively simple to destroy the large, the powerful, and the complex. The moms had taught them tactics and general strategies; how to use the weapons, and how to avoid direct encounters with superior defenses.

But the morns had not told them everything they wanted to know, and as time progressed, the lack of trust or confidence or whatever it might be called rankled many of the children.

Martin tried not to question. He tried not to think too deeply; to lose himself in the drills and the training, and to concentrate on being a good Pan.

Still, the dreams came, and memories of Theodore Dawn. Theodore had been a good friend to Martin, practically his only friend in the beginning. Witty, learned, Theodore had spent hours alone with Martin, talking. Martin had helped Theodore study vats of terrestrial pond water, the little micro-organisms and crustaceans and insect larvae supplied from the ship's biological records.

But two years into the journey, Theodore had used a ladder field to hang himself and the moms had not tried to stop him. Freedom of choice.

The moms did not discipline the children or issue direct orders; nor did they protect the children from themselves.

If we all tried to kill ourselves, would they intervene? What if we went to war with each other?