"Cody." He did his best to look sincere. "I'm so very sorry. I never thought it would work. Not like this. But I do think the antidote might work." His face went back to normal. He hefted the inhaler. "Though before I give it to you, I have a favor to ask."

She stared at him. "On what planet do I owe you anything?"

"For science, then. A follow-up scan, and then another after you take the antidote."

"Maybe I won't take it. Give me the number."

"Love is a form of insanity, you know."

"The number."

In the other room, the bad singing went on and on.

"Oh, all right. For old time's sake." He extracted a folder from his bag, and a piece of paper from the folder. He slid it across the table towards her, put the inhaler on top of it.

She nudged the inhaler aside, picked up the paper. Handwritten. Susanna's writing.

"Love's just biochemical craziness," he said, "designed to make us take a leap in the dark, to trust complete strangers. It's not rational."

Cody said nothing.

"She screwed us."

"She screwed you," Cody said. "Maybe she fell in love with me." But she took the inhaler.

Cody sat in the window seat with the phone and the form Susanna had filled in. Every now and again she punched in a different combination of the numbers Susanna had written and got the Cannot be completed as dialed voice. Every now and again she touched the form with the tip of her middle finger; she could feel the indentation made by Susanna's strong strokes. Strong strokes, strong hands, strong mouth.

She didn't think about the grey inhaler in its white box, which she had put in the fridge-to stay viable a long time, just in case.

After a while she stopped dialing and simply waited.

When her phone lit up at 11:46 she knew who it was-even before she saw the 404 area code on the screen.

"Do you feel it?" Susanna said.

"Yes," and Cody did. Whatever it was, wherever it came from, it was there, as indelible as ink. She wanted to say, I don't know if this is real, I don't know if it's good. She wanted to ask, Had you ever had sex with anyone for money before me? and, Does it matter? She wanted to know, Have you ever loved anyone before? and, How can you know?

She wanted to say, Will it hurt?

Walking through the crowds at the airport, Cody searched for the familiar face, felt her heart thump every time she thought she saw her. Panic, or love? She didn't know. She didn't know anything except that her throat ached.

Someone jostled her with his bag, and when she looked up, there was the back of that head, that smooth brown hair, so familiar, after just one night, and all her blood vessels seemed to expand at once, every cell leapt forward.

She didn't move. This was it, the last moment. This was where she could just let the crowd carry her past, carry her away, out into the night. Walk away. Go home. Use the inhaler in the fridge.

That was the sensible thing. But the Cody who had hung from the ninth-story balcony, the Cody who had risked the Atlanta contract without a second thought, that Cody thought, Fuck it, and stepped forward. Will it hurt? You could never know.

She had no idea where she was going. When she needed to sleep she stopped at the first motel; when the Buick's gas gauge dropped into the red zone she filled the tank, and sometimes bought a sandwich or orange juice at the attached convenience store. Now and then during one of these stops she spoke with someone who was neither a desk clerk nor a gas-station attendant, but she forgot all such conversations within minutes, as she forgot everything but the words of the young policeman who had come to her door on a pleasant Wednesday afternoon, weeks and worlds ago. Nothing had moved in her since that point except the memory of his shakily sympathetic voice, telling her that her husband and daughter were dead: ashes in a smoking, twisted, unrecognizable ruin, because, six blocks from their home, a drowsy adolescent had mistaken his accelerator for his brake pedal.

There had been a funeral-she was present, but not there-and more police, and some lawyer; and Alan's sister managing it all, as always, and for once she was truly grateful to the interfering bitch. But that was all far away too, both the gratitude and the old detestation, made nothing by the momentary droop of a boy's eyelids. The nothing got her snugly through the days after the funeral, dealing with each of the endless phone calls, sitting down to answer every condolence card and e-mail, informing Social Security and CREF of Alan's death, going with three of his graduate students to clean out his office, and attending the memorial on campus, which was very tasteful and genuinely moving, or so the nothing was told. She was glad to hear it.

The nothing served her well until the day Alan's daughter by his first marriage came to collect a few of his possessions as keepsakes. She was a perfectly nice girl, who had always been properly courteous in an interloper's presence, and her sympathy was undoubtedly as real as good manners could make it; but when she had gone, bearing a single brown paper grocery bag of photographs and books, the nothing stepped aside for the meltdown.

Her brother-in-law calmed her, spoke rationally, soothed her out of genuine kindness and concern. But that same night, speaking to no one, empty and methodical, she had watched herself pack a small suitcase and carry it out to Alan's big old Buick in the garage, then go back into the house to leave her cell phone and charger on Alan's desk, along with a four-word note for her sister-in-law that read Out for a drive. After that she had backed the Buick into the street and headed away without another look at the house where she used to live, once upon a time.

The only reason she went north was that the first freeway on-ramp she came to pointed her in that direction. After that she did not drive straight through, because there was no through to aim for. With no destination but away, without any conscious plan except to keep moving, she left and returned to the flat ribbon of the interstate at random intervals, sometimes wandering side roads and backroads for hours, detouring to nowhere. Aimless, mindless, not even much aware of pain-that too having become part of the nothing-she slogged onward. She fell asleep quickly when she stopped, but never for long, and was usually on her way in darkness, often with the moon still high. Now and then she whistled thinly between her teeth.

The weather was warm, though there was still snow in some of the higher passes she traversed. Although she had started near the coast, that was several states ago: now only the mountains were constant. The Buick fled lightly over them, gulping fuel with abandon but cornering like a deer, very nearly operating and guiding itself. This was necessary, since only a part of her was behind the wheel; the rest was away with Alan, watching their daughter building a sandcastle, prowling a bookshop with him, reaching for his hand on a strange street, knowing without turning her head that it would be there. At times she was so busy talking to him that she was slow to switch on the headlights, even long after sunset. But the car took care of her, as she knew it would. It was Alan's car, after all.

From time to time the Buick would show a disposition to wander toward the right shoulder of the road, or drift left into the oncoming lane, and she would observe the tendency with vague, detached interest. Once she asked aloud, "Is this what you want? I'm leaving it to you-are you taking me to Alan?" But somehow, whether under her guidance or its own, the old car always righted itself, and they went on together.