And that wasn’t a bad thing. In fact, it was quite nice in her single room at Brown, peaceful and quiet and serene. It overlooked the quad, so she could look out the window and see the campus from behind glass, like a diorama, but not be forced to live it 24/7. She loved the parties, the people, the act you put on when you were out there. But After Dennis she found that she couldn’t do it all the time. Up here, Mary didn’t have to act in that soap opera if she didn’t want to. She could stand well outside of it and pity the girls who flung themselves into the game so readily.

Sometimes she looked out that window and wondered what Dennis was doing right then. Sometimes she thought she saw him, his curly hair bouncing along, down below her. Every time this happened her heart squeezed, her breath caught in her throat. For a long time she had gone out of her way to avoid him, but inevitably they had begun to run into each other on campus. And now, of course, he was in one of her classes. She nearly died when he walked in to Seminary East. He saw her and winked-only Dennis Flaherty could wink in the twenty-first century and get away with it-and sat four chairs to her right. It was the closest he’d been to her in two years.

She was thinking about how she was going to drop the class and pick up something else on such short notice when Williams walked in.

Immediately, Mary noticed something different about him. The way he walked, the way he spoke to his class: so not like a professor. And when he launched into his story about the girl named Polly, Mary forgot all about Dennis and was lost in this bizarre class.

“Who’s the prof?” Summer asked her when they met up in the dining commons that evening.

“Williams,” Mary said.

“Hmm. Never heard of him,” the other girl said.

And neither had Mary. Which was strange, because she had gofered for at least ten professors around campus. Surely someone would have mentioned him to her. Surely she would have seen him at a Christmas party or something. Not only did Williams fail to appear in any of her three face books, he was also missing from her annuals. There were no publications listed in the campus magazine, no news of him on the faculty page, no references in the recent edition of the school paper. It didn’t make any sense. It was, as Summer liked to say, freaky.

That night, Mary browsed Winchester’s website, trying to find information about him. He was a member of the philosophy faculty, and he was listed as an associate professor. There was a CV: BA from Indiana University, 1964; MA from same, 1970; PhD from Tulane, 1976. That was all. Google him, she thought, but then she remembered that she didn’t know his first name. All she knew was the initial that was on her schedule of classes: L.

Earlier, she had repeatedly refreshed her screen, attempting to be the first to read the e-mailed clues. But now it was 8:00 p.m., and still no message from Williams had arrived in her in-box.

She took a shower (along with the biggest single room in the dorm, she also had her own bathroom and kitchenette; some girls on the third floor had taken to calling Mary’s room the Hyatt) and tried to take her mind off the class, but she couldn’t. She had been intrigued by Professor L. Williams, and had even found him to be kind of sexy. This was not unusual for Mary. She had formed a nagging and perhaps unhealthy crush on Dr. Cunningham last year. This would not have been odd had Dr. Cunningham not been strange in most every way, from his lisp to the pink ten-speed with a basket that he rode about campus, and it did not escape Mary that maybe she found some professors attractive only because the other students did not. Many of the students in Logic and Reasoning 204 had found Williams creepy-they had said as much in the hallway after class.

Out of the shower now, her hair wet and a towel around her-another perk of the single room was Mary’s ability to walk around naked-she logged on to her Winchester account and checked her e-mail again.

There was a message from Professor Williams. The subject line read, “First Clue.”

Mary opened the e-mail and read.

Time

Polly was last seen on Friday, August the first at a party. This was a going-away party in Polly’s honor, because she would be leaving for college soon. All her friends were there, including an ex-boyfriend named Mike. Mike and Polly had problems. Mike would sometimes hit Polly.

One night toward the end of their relationship Polly had to call the police, but she refused to press charges once they showed up. Polly returned from the going-away party that night to her father’s home on During Street, where she was staying for the summer. Her father was awake when she came home, watching David Letterman. He told the police that he had sat with Polly and watched television, and when she fell asleep he carried her to bed, “like I used to do when she was a girl.” He hasn’t seen her since.

Police speculate that early in the morning of August the second, Polly left the house. Her red Honda Civic was found beside Stribbling Road, about twenty miles out of town. When Mike Reynolds, Polly’s ex-boyfriend, was questioned, he of course denied seeing Polly after the going-away party. The problem with Mike’s culpability in Polly’s disappearance is this: Mike was at the party until the next morning, and many witnesses told investigators that they had seen Mike sleeping on the couch. In Polly’s car, investigators found no traces that Polly had been planning to leave for an extended time: there were no bags in the trunk, no changes of clothes in the backseat. The only fingerprints in the car were Polly’s. There was no sign of struggle.

Polly’s father received a telephone call on Monday, August 4. The caller sounded distant, as if she were “at the bottom of the well.” Polly’s father thought he had heard the caller say, “I’m here,” but by the time he was questioned by police he couldn’t be sure. Investigators traced all calls made to the During Street residence on the fourth of August, and there was one unusual call made at 7:13 that evening. Unfortunately, the number was unknown.

When Mary returned to her in-box, she saw that Professor Williams had sent another message. It was called “The Syllabus.” Mary clicked on it and waited while an image materialized on her monitor. The image was of a man being executed at the gallows. Mary could see the smudged expressions of some onlookers who stood below, watching. There was a blurring around the edges of the photograph, as if it had been taken just as the man dropped through the trapdoor. The man was hooded, and someone had cropped an image onto the velvet hood. Mary squinted to see it, and finally she made it out.

It was a question mark.

The mark was like a shadow, vaguely discernible. It was, Mary thought, as if it had been knitted into the fabric.