Dr. Burrows, cheeks puffed, braced himself for yet another not-quite-antique egg timer or battered tin of used pen nibs. He was taken off guard when, with a magician's flourish, Oscar held up a small, gently glowing globe, slightly larger than a golf ball, encased in a metal cage that was a dull gold in color.

"It's a fine example of a… a light… thing of some…," Oscar trailed off. "Well, as a matter of fact, I don't know what to make of it!"

Dr. Burrows took the item and was so fascinated that he quite forgot Oscar was watching him intently as he chewed his mouthful of chocolate.

"Teeth giving you trouble, my boy?" Oscar asked. "I used to grind them like that, too, when they got bad. Just awful — know exactly how you feel. All I can say is I took the plunge and had them all out in one go. It isn't so uncomfortable, you know, once you get used to one of these." He started to reach into his mouth.

"Oh, no, my teeth are fine," Dr. Burrows managed to say, quickly trying to head off the prospect of seeing the old man's dentures. He swallowed the last of the chocolate in his mouth with a large gulp. "Just a little dry today," he explained, rubbing his throat. "Need some water."

"Ohhh, better keep an eye on that, y'know. Might be a sign that you've got that diabetes malarkey. When I was a lad, Roger" — Oscar's eyes seemed to glaze over as he remembered — "some doctors used to test for diabetes by tasting your…" He lowered his voice to a whisper and looked down in the direction of the floor. "…waters, if you know what I mean, to see if there was too much sugar in them."

"Yes, yes, I know," Dr. Burrows replied automatically, far too intrigued by the gently glowing globe to pay any attention to Oscar's medical curiosities. "Very strange. I would venture to say, offhand, that this dates from possibly the nineteenth century, looking at the metalwork… and the glass I would say is early, definitely hand-blown… but I have no idea what's inside. Maybe it's just a luminous chemical of some type — have you had it out in the light for long this morning, Mr. Embers?"

"No, kept it safe in my coat since Mrs. Tantrumi gave it to me yesterday. Just after breakfast, it was. I was on my constitutional — it helps with the old bowel mov—"

"I wonder if it could be radioactive," Dr. Burrows interrupted sharply. "I've read that some of the Victorian rock-and-mineral collections in other museums have been tested for radioactivity. Some pretty fierce specimens were uncovered in a batch up in Scotland — powerful uranium crystals that they had to shut away in a lead-lined csket. Too hazardous to keep out on display."

"Oh, I hope it's not dangerous," Oscar said, taking a hasty step back. "Been walking around with it next to my new hip — just imagine if it's melted the—"

"No, I don't expect it's that potent — it probably hasn't done you any real harm, not in twenty-four hours." Dr. Burrows gazed into the sphere. "How very peculiar, you can see liquid moving inside… Looks like it's swirling… like a storm…" He lapsed into silence, then shook his head in disbelief. "No, must be you know… thermoreactive."

"Well, I'm delighted you think it's interesting. I'll let Mrs. Tantrumi know you want to hang on to it," Oscar said, taking another step back.

"Definitely," Dr. Burrows replied. "I'd better do some research before I put it out, just to make sure it's safe. But in the meantime I should drop Mrs. Tantrumi a line to thank her, on behalf of the museum." He hunted in his jacket pocket for a pen but couldn't find one. "Hold on a sec, Mr. Embers, while I fetch something to write with."

He walked out of the main hall and into the corridor, managing to stumble over an ancient length of timber dug out of the marshes the previous year by some overzealous locals who swore blindly that it was a prehistoric canoe. Dr. Burrows opened the door with curator painted on the frosted glass. The office was dark, because the only window was blocked by crates stacked high in front of it. As he groped for the light on his desk, he happened to uncurl his hand a little from around the sphere. What he saw completely astounded him.

The light it was giving off appeared to have turned from the soft glow he'd witnessed in the main hall to a much more intense, light green fluorescence. As he watched it, he could have sworn that the light was growing even brighter, and the liquid inside moving even more vigorously.

"Remarkable! What substance becomes more radiant the darker the surroundings?" he muttered to himself. "No, I must be mistaken, it can't be! It must be that the luminosity is just more noticeable in here."

But it had grown brighter; he didn't even need his desk light to locate his pen because the globe was giving off a sublime green light, almost as bright as daylight. As he left his office and returned with his donations ledger to the main hall, he held the globe aloft in front of him. Sure enough, the moment he emerged back into the light, it dimmed again.

Oscar was about to say something, but Dr. Burrows rushed straight past him, through the museum door, and out onto the street. He heard Oscar shouting, "I say! I say!" as the museum door slammed shut behind him, but Dr. Burrows was so intent on the sphere that he completely ignored him. As he held it up in the daylight, he saw that the glow was all but extinguished and that the liquid in the glass sphere had darkened to a dull grayish color. And the longer he remained outside, exposing the sphere to natural light, the darker the fluid inside became, until it was almost black and looked like oil.

Still dangling the globe in front of him, he returned inside, watching as the liquid began to whip itself up into a miniature storm and shimmer eerily again. Oscar was waiting for him with concern on his face.

"Fascinating… fascinating," Dr. Burrows said.

"I say, thought you were having an attack of the vapors, old chap. I wondered if maybe you needed some air, rushing out like that. Not feeling faint, are you?"

"No, I'm fine, really I am, Mr. Embers. Just wanted to test something. Now, Mrs. Tantrumi's address, if you'd be so kind?"

"So glad you're pleased with it," Oscar said. "Now, while we're about it, I'll let you have my dentist's number so you can get those teeth seen to, pronto."

Will was leaning on the handlebars of his bicycle at the entrance to a stretch of wasteland encircled by trees and wild bushes. He glanced at his watch yet again and decided he would give Chester another five minutes to turn up, but no more. He was wasting precious time.

The land was one of those forgotten lots you find on the outskirts of any town. This one hadn't yet been covered by housing, probably due to its proximity to the municipal waste station and the mountains of trash that rose and fell with depressing regularity. Known locally as "the Forty Pits," owing to the numerous craters that pitted its surface, some almost reaching ten feet in depth, it was the arena for frequent battles between two opposing teenage gangs, the Clan and the Click, whose members were drawn from Highfield's rougher housing projects.

It was also the favored spot for kids on their dirt bikes and, increasingly, stolen mopeds, the latter being run into the ground and then torched, their carbon black skeletons littering the far edges of the Pits, where weeds threaded up through their wheels and around their rusting engine blocks. Less frequently, it was also the scene for such sinister adolescent amusements as bird or frog hunting; all too often, the creatures' sorry little carcasses were impaled on sticks.

As Chester turned the corner toward the Pits, a bright metallic glint caught his eye. It was the polished face of Will's shovel, which he wore slung across his back like some samurai construction worker.