Diogenes has sent me a letter consisting of only one thing: a date, January 28. In all likelihood, the crime will be committed on that date. I would not, however, make any assumptions-the date could mean nothing at all. Diogenes is, if anything, unpredictable.

You will need to take a leave of absence from the Southampton P.D. or wherever you are currently employed. This cannot be avoided. Get all the information you can from Detective Captain Laura Hayward, but for her own sake minimize her involvement. Diogenes is an expert on forensics and police procedure, and any information left at the scene of the crime-assuming, God forbid, you are not in time to stop said crime-will no doubt be cleverly contrived to mislead the police. Hayward, as fine an officer as she is, is no match for my brother.

I've left a separate note for Constance, who will at this point know all the particulars of this matter. She will make my house, my finances, and all my resources available to you. She will immediately put at your disposal a bank account containing $500,000 in your name, to use as you see fit. I recommend that you use her invaluable research skills, though I ask that you keep her out of your direct investigation for obvious reasons. She must never leave the mansion-ever. And you must watch her very, very carefully. She is still fragile, both mentally and physically.

As a first step, you should pay a visit to my Great-Aunt Cornelia, who is confined to a hospital on Little Governors Island. She knew Diogenes as a boy, and she will provide you with the personal and family information you will undoubtedly need. Treat this information-and her-with great care.

One final word. Diogenes is consummately dangerous. He is my intellectual equal, but he was somehow formed without the slightest shred of moral conscience. In addition, a severe childhood illness left him damaged. He is motivated by an undying hatred of myself and an utter contempt for humanity. Do not gain his attention any earlier than you have to. Be vigilant at all times.

Goodbye, my friend-and good luck.

Aloysius Pendergast

D'Agosta looked up. "January 28? My God, that's just one week away."

Constance only bowed her head.

IT was the smell of the place, she thought, that really brought home the fact she was back in the museum: that mixture of mothballs, dust, old varnish, and a whiff of decay. She walked down the great fifth-floor corridor, past the oaken office doors, each sporting the name of a curator in black-edged gold leaf. She was surprised at how few new names there were. A lot of things had changed in six years, but here, in the museum, time seemed to run at a different pace.

She had been worried-more worried than she cared to admit- about how it would feel to be back in the museum several years after the most frightening experience of her life. In fact, that worry had delayed her decision to return. But she had to admit, after a slightly rough first couple of days, that little of the old terror still clung to the place. Her nightmares, the lingering sense of vulnerability, had faded with the years. The old events, the bad events, were now ancient history. And the museum was still a wonderful old pile, a Gothic castle of Brobdingnagian proportions, full of wonderful, eccentric people-and bursting with strange and fascinating specimens. The most extensive collection of trilobites in the world. Lucifer's Heart, the most precious diamond ever found. "Snaggletooth," the largest and best-preserved T. rex fossil known.

Nevertheless, she had been careful not to stray into the museum's sub-basement. And it was not laziness that made her limit the number of nights she worked much past closing.

She remembered the time when she had walked down this august corridor for the first time as a graduate student of no account. Graduate students were so low on the museum's totem pole they were not even despised-they were simply invisible. Not that she'd been resentful: it was a rite of passage everyone had to go through. Back then she was a nobody-a "you," or, at best, a "Miss."

How things had changed. Now she was "Doctor," sometimes even "Professor," and her name appeared in print with a string of titles after it: Pierpont Research Fellow (the "fellow" part always made her smile); adjunct professor of ethnopharmacology; and her most recent title, only three weeks old: editor in chief of Museology. While she'd always told herself that titles meant nothing, she was surprised to discover that, once she'd acquired them, they were most gratifying. Professor… that had a nice round sound to it, especially on the lips of those crusty old curators who, six years ago, wouldn't even give her the time of day. Now they went out of their way to ask her opinion or press their monographs on her. Just that morning, no less a personage than the head of anthropology and her titular boss, Hugo Menzies, had asked solicitously after the subject of her panel discussion for the forthcoming Society of American Anthropologists meeting.

Yes: a refreshing change, indeed.

The office of the director lay at the end of the hall, in one of the coveted tower offices. She paused before the great oaken door, darkened with the patina of a century. She raised her hand, then lowered it, suddenly feeling nervous. She took a deep breath. She felt happy to be back in the museum, and she wondered yet again if the sudden controversy she was about to launch herself into wasn't a serious mistake. She reminded herself that this controversy had been forced on her and that as editor of Museology she had to take a stand. If she ducked this one, she would immediately lose her credibility as an arbiter of ethics and free expression. Worse, she wouldn't be able to live with herself.

Her hand fell firmly upon the oaken door, once, twice, three times, each knock firmer than the last.

A moment of silence. Then the door was opened by Mrs. Surd, the dry and efficient secretary to the museum's director. The sharp blue eyes gave her a rapid once-over as she stepped aside.

"Dr. Green? Dr. Collopy is expecting you. You may go straight in."

Margo approached the inner door, if anything darker and more massive than the other, grasped the ice-cold brass knob, turned it, and pushed it open on well-oiled hinges.

There, behind the great nineteenth-century desk, under a vast painting by De Clefisse of Victoria Falls, sat Frederick Watson Collopy, director of the New York Museum of Natural History. He rose graciously, a smile creasing his handsome face. He was dressed in a somber gray suit of old-fashioned cut, the starched white shirtfront enlivened only by a bright red silk bow tie.

"Ah, Margo. How good of you to come. Please take a seat."

How good of you to come. The note she had received had more the flavor of a summons than an invitation.

Collopy came around his desk and indicated a plush leather armchair which formed part of a group arrayed before a pink marble fireplace. Margo sat down and Collopy followed, taking a seat opposite her.

"Care for anything? Coffee, tea, mineral water?"

"Nothing, thank you, Dr. Collopy."

He leaned back, threw one leg casually over the other.

"We're so pleased to have you back at the museum, Margo," he said in his old New York society drawl. "I was delighted when you agreed to accept the editorship of Museology. We felt so lucky to lure you away from GeneDyne. Those research papers you published really impressed us, and your background here in ethnopharmacology made you the perfect candidate."

"Thank you, Dr. Collopy."

"And how do you find it? Everything to your satisfaction?" His voice was genteel, even kind.