“Or the chimney sweep.”

“And then there’s the cellar!” Xemerius acted as if he hadn’t heard my down-to-earth remark. “Do your neighbors know this house has a secret, and there’s a second cellar underneath the cellar that everyone knows about? Although if you go looking for anything there, you’d better not be scared of spiders.”

“Then we’d better look somewhere else first,” I said, quite forgetting to whisper.

“If we knew what we’re looking for, of course it would be easier.” Xemerius scratched his chin with one of his back paws. “I mean, basically it could be anything: the stuffed crocodile in the recess, the bottle of Scotch behind the books in the library, the bundle of letters in the secret drawer of your great-aunt’s desk, the little chest in a hollow place in the brickwork—”

“A chest in the brickwork?” I interrupted him. And what recess was he talking about?

Xemerius nodded. “Oh, dear, I think you’ve woken your brother up.”

I spun round. My twelve-year-old brother, Nick, was standing in the doorway of his room, running both hands through his untidy red hair. “Who are you talking to, Gwenny?”

“It’s the middle of the night,” I whispered. “Go back to bed, Nick.”

Nick looked at me undecidedly, and I could see him waking up more and more every second. “What was all that about a chest in the brickwork?”

“I … I was going to look for it, but I think I’d better wait until it’s light.”

“Nonsense,” said Xemerius. “I can see in the dark like a … well, let’s say an owl. And you can’t very well search the house when everyone’s awake. Not unless you want even more company.”

“I can bring my flashlight,” said Nick. “What’s in the chest?”

“I don’t know exactly.” I thought for a moment. “It could be something left there by Grandpa.”

“Oh,” said Nick, interested. “And whereabouts is this chest hidden?”

I looked inquiringly at Xemerius.

“I saw it to one side of the secret passage behind that fat man with whiskers, the one sitting on his horse,” said Xemerius. “But who goes hiding secrets—I mean treasures—in a boring old chest? I think the crocodile is much more promising. Who knows what it’s stuffed with? I’m in favor of slitting it open.”

I wasn’t. I had an idea I’d met that crocodile before. “Let’s look in the chest first. A hollow place doesn’t sound bad.”

“Boring, boring, boring!” repeated Xemerius. “One of your ancestors probably hid his tobacco from his wife in it … or…” Obviously he had just had an idea he liked, because now he suddenly grinned. “Or the chopped-up body of a maid who stepped off the straight and narrow and went astray!”

“The chest is in the secret passage behind the picture of Great-great-great-great-great-uncle Hugh,” I explained to Nick. “But—”

“I’ll just get that flashlight!” My brother had already turned back to his room.

I sighed.

“Why are you sighing again?” Xemerius rolled his eyes. “It can’t hurt if your brother comes along.” He spread his wings. “I’ll just do a round of the house and make sure the rest of the family are fast asleep. We don’t want that sharp-nosed aunt of yours catching us when we find the diamonds.”

“What diamonds?”

“Think positive for once!” Xemerius was already hovering in the air. “Which would you rather, diamonds or the remains of a murdered maidservant? It’s all a question of attitude. We’ll meet in front of your fat uncle on his horse.”

“Are you talking to a ghost?” Nick had reappeared behind me. He switched off the ceiling light in the corridor and put his flashlight on instead.

I nodded. Nick had never doubted that I really could see ghosts—quite the opposite. Even when he was only four and I was eight, he used to stand up for me if people didn’t believe it. Aunt Glenda, for instance. We always quarreled when she went to Harrods with us and I talked to the nice uniformed doorman Mr. Grizzle. Mr. Grizzle had been dead for fifty years, so of course people wondered why I stopped and started talking about the Royal Family (Mr. Grizzle was a great admirer of the Queen) and the unseasonably wet June we were having (the weather was Mr. Grizzle’s second favorite subject of conversation). A lot of passersby laughed, some said children had such wonderful imaginations (ruffling up my hair to emphasize their point), and many others shook their heads, but no one got as worked up as Aunt Glenda. She used to look terribly embarrassed and haul me on after her, scolding if I braced my feet and stood my ground. She said I ought to follow Charlotte’s example (even then, Charlotte was so perfect that she never lost a barrette out of her hair), and worst of all, she threatened me with getting no dessert that evening. But although she carried out her threat (and I loved all desserts, even stewed plums), I simply couldn’t bring myself to walk past Mr. Grizzle without a word. Nick always tried to help by begging Aunt Glenda to let go of me because there was no one else for poor Mr. Grizzle to talk to, and Aunt Glenda cleverly got the better of him by saying, in sugary sweet tones, “Oh, little Nick, when will you understand that your sister is just trying to attract attention? There are no such things as ghosts. Do you see a ghost here?”

Nick always had to shake his head sadly and then Aunt Glenda would smile triumphantly. On the day when she decided never to take us to Harrods with her again, Nick had surprised me by changing his tactics. Tiny and plump-cheeked at the time—he was such a cute little boy, with an adorable lisp—he had stopped right in front of Aunt Glenda and asked, “Do you know what Mr. Grizzle said to me, Aunt Glenda? He said you’re a nasty frowsty old witch!” Of course Mr. Grizzle would never have said such a thing, he was much too polite, and Aunt Glenda was too good a customer, but my mum had said something rather like it the evening before. Aunt Glenda pressed her lips together and stalked on, holding Charlotte’s hand. Back home there had been an unpleasant scene with my mother, who was cross because we’d had to find our way home on our own, and Aunt Glenda had said in icy tones that Mum was responsible for the frowsty witch remark, and the upshot was that we weren’t allowed to go shopping with Aunt Glenda ever again. But even now we liked saying “frowsty.”

When I got older, I stopped telling people I could see things that they couldn’t. That’s best if you don’t want to be thought crazy. But I never had to pretend to Nick, Caroline, and Lesley, because they believed in my ghosts. I wasn’t quite sure about Mum and Great-aunt Maddy, but at least they never laughed at me. Aunt Maddy had strange visions herself at irregular intervals, so she probably knew just how it felt when no one believed you.

“Is he nice?” whispered Nick. The beam of his flashlight danced over the stairs.

“Who?”