"No, I don't usually, but Chester 's cool," Will replied, a bit taken aback by his sister's interest. "He's been a real help."

"Can't say I know much about him, except that he's called—"

"I know what they call him," Will cut her off sharply.

At twelve, Rebecca was two years younger than Will and couldn't have been more different from him; she was slim and dainty for her age, in contrast to her brother's rather stocky physique. And with her dark hair and sallow complexion, she wasn't bothered by the sun, even at the height of summer, while Will's skin would begin to redden and burn in a matter of minutes.

The two of them being so completely dissimilar, not just in appearance but also in temperament, their home life had something of the feel of an uneasy truce, and each showed only a passing interest in the other's pursuits.

There weren't the family outings that you would ordinarily expect, either, because Dr. And Mrs. Burrows also had completely divergent tastes. Will would go off with his father on expeditions — a habitual destination was the south coast, where they would go fossil hunting.

Rebecca, on the other hand, would arrange her own vacations — where, or to do what, Will did not know or care. And on the rare occasions Mrs. Burrows ventured out of the house, she would just trudge around the shops in the West End of London or catch the latest films.

Tonight, as was the case most nights, the Burrowses were sitting with their meals on their laps watching an oft-repeated 1970s comedy that Dr. Burrows seemed to be enjoying. No one spoke during the meal except Mrs. Burrows, who at one point mumbled, "Good… this is good," which may have been in praise of the microwave food or possibly the finale of the dated sitcom, but nobody made the effort to inquire.

Having wolfed down his food, Will left the room without a word, placing his tray by the kitchen sink before he went bounding up the stairs, a canvas sack of recently discovered items clutched in his hands. Dr. Burrows was the next out, walking into the kitchen, where he deposited his tray on the table. Although she hadn't finished her food yet, Rebecca followed closely behind him.

"Dad, a couple of bills need paying. The checks are there on the table."

"Have we got enough in the account?" he asked as he dashed off his signature on the bottom of the checks, not evben bothering to read the amounts.

"I told you last week, I got a better deal on the house insurance. Saved us a few pennies on the premium."

"Right… very good. Thanks," Dr. Burrows said, picking up his tray and turning purposefully toward the dishwasher.

"Just leave it on the side," Rebecca said a little too quickly, stepping protectively in front of the dishwasher. Only last week she'd caught him attempting to program her beloved microwave by furiously jabbing at the buttons in random sequences, as if he was trying to crack some secret code, and ever since then she had been making sure she unplugged all the major appliances.

As Dr. Burrows left the room, Rebecca shoved the checks in envelopes and then sat down to prepare a shopping list for the next day. At the tender age of twelve, she was the engine, the powerhouse behind the Burrowses' home. She took it upon herself not just to do the shopping but also to organize the meals, supervise the cleaning lady, and do just about everything else that, in any ordinary household, the parents would have taken responsibility for.

To say Rebecca was meticulous in her organization would have been a gross understatement. A schedule on the kitchen bulletin board listed all the provisions she required for at least two weeks in advance. She kept carefully labeled files of the family's bills and financial situation in one of the kitchen cupboards. And the only times when this smooth operation of the household began to falter were on the occasions that Rebecca was absent. Then the three of them, Dr. and Mrs. Burrows and Will, would subsist on the food Rebecca had left for them in the freezer, helping themselves when they felt like it with all the delicacy of a pack of marauding wolves. After these absences, Rebecca would simply return home and put the house back in order again without protest, as if she accepted that her lot in life was to tidy up after the other members of her family.

Back in the living room, Mrs. Burrows flicked a remote to commence her nightly marathon of soaps and talk shows while Rebecca cleaned up in the kitchen. By nine o'clock, she had completed her chores and, sitting at the half of the kitchen table that wasn't taken up by the numerous empty coffee jars Dr. Burrows kept promising he'd do something with, had finished off her homework. Deciding it was time for bed, she picked up a pile of clean towels and went upstairs with them under her arm. Passing the bathroom, she hesitated as she happened to glance in. Will was kneeling on the floor, admiring his new finds and washing the soil off them using Dr. Burrows's toothbrush.

"Look at these!" he said proudly as he held up a small pouch made of rotten leather, which dripped dirty water everywhere. He proceeded to very gently pry open the fragile flap and lifted out a series of clay pipes. "You usually only find the odd piece… bits the farm laborers dropped. But just look at these. Not one of them is broken. Perfect as the day they were made… Think of it… all those years ago… the eighteenth century."

"Fascinating," Rebecca said, without the vaguest suggestion of any interest. Flicking back her hair contemptuously, she continued across the landing to the linen cupboard, where she put the towels, and then into her room, closing the door firmly behind her.

Will sighed and resumed the inspection of his finds for several minutes, then gathered them up in the mud-stained bathroom mat and carefully conveyed them to his bedroom. Here he thoughtfully arranged the pipes and the still-sopping leather pouch next to his many other treasures on the shelves that completely covered one wall of the room — his museum, as he called it.

Will's bedroom was at the front of the house, Rebecca's at the back, and it must have been about two o'clock in the morning when he was woken by a sound. It came from the garden.

"A wheelbarrow?" he said, immediately identifying it as his eyes flicked open. "A loaded wheelbarrow?" He scrambled out of bed and went to the window. There, in the light of the half-moon, he could make out a shadowy form pushing a barrow down the path. He squinted, trying to see more.

"Dad!" he said to himself as he recognized his father's features and saw the glint of moonlight from his familiar specs. Mystified, Will watched as his father reached the end of the garden and passed through the gap in the hadge and then out onto the Common. Here, Will lost sight of him behind some trees.

"What is he up to?" Will muttered. Dr. Burrows had always kept strange hours because of his frequent catnaps in the museum, but this level of activity was unusually lively for him.

Will recalled how, earlier that year, he had helped his father excavate and lower the floor of the cellar by nearly three feet and then lay a new concrete floor to increase the headroom down there. Then, a month or so later, Dr. Burrows had had the bright idea of digging an exit from the cellar up to the garden and putting in a new door because, for some reason or other, he'd decided that he needed another means of entry to his sanctuary at the bottom of the house. As far as Will knew, the job had finished there, but his father could be unpredictable. Will felt a pang of resentment — what was his father doing that meant he had to be so secretive, and why hadn't he asked Will to help him?

Still groggy with sleep and distracted by thoughts of his own underground projects, Will put it from his mind for the time being and returned to bed.