Paolo Giordano - The Solitude of Prime Numbers

"We drove around for half an hour in search of two free parking spaces because you couldn't get into a single one," he said, to banish those thoughts.

"It was just an excuse to keep you with me," Alice replied. "But you never understood anything."

They both laughed, to stifle the ghosts let loose by her words.

"Where do I go?" asked Mattia, becoming serious.

"Turn here."

"Okay. But then that's enough. I'll let you have your seat back."

He changed from third to second without Alice having to tell him, and took the curve well. He turned into a shady street, narrower than the other one and without the dividing line down the middle, squashed between two rows of identical, windowless buildings.

"I'll stop down there," he said.

They were almost there when a tractor trailer truck appeared from around the corner, heading straight toward them and taking up most of the road.

Mattia gripped the wheel tightly. His right foot didn't have the instinct to hit the brake, so he accelerated instead. With her good leg Alice searched for a pedal that wasn't there. The truck didn't slow down, but merely moved slightly to its side of the road.

"I can't get by," said Mattia. "I can't get by."

"Brake," said Alice, trying to seem calm.

Mattia couldn't think. The truck was a few meters away and only now did it show any sign of slowing down. He felt his foot contracting on the accelerator and thought about how he could pass it. He remembered how he used to ride his bike down the ramp of the bike path and how at the end he'd have to brake abruptly in order to get between the posts that blocked the cars entering. But Michela never slowed down, she'd go right between them on her bike with training wheels, but never once did she so much as brush them with the handlebars.

He turned the steering wheel to the right and seemed to be heading straight for the wall.

"Brake," Alice repeated. "The middle pedal."

He pressed it down hard, with both feet. The car jerked violently forward and came to a standstill just a few feet from the wall.

The recoil made Mattia bang his head against the left-hand window, but the seat belt held him in place. Alice rocked forward like a bending twig, but held on tightly to the door handle. The truck, two long, red segments, sped past them, indifferently.

They sat in silence for a few seconds, as though contemplating something extraordinary. Then Alice started laughing. Mattia's eyes stung and the nerves in his neck pulsed as if they had all been suddenly inflated and were about to explode.

"Did you hurt yourself?" Alice asked. It was as if she couldn't stop laughing.

Mattia was terrified. He didn't reply. She tried to become serious again.

"Let me see," she said.

She freed herself from her seat belt and stretched over him as he stared at the wall directly in front of them. He was thinking about the word anelastic. About how the kinetic energy now making his legs tremble would have been unleashed all at once on impact.

At last he took his feet off the brake and the car, its engine off, slipped backward slightly, down the almost imperceptible slope of the road. Alice pulled on the hand brake.

"You're fine," she said, brushing Mattia's forehead.

He closed his eyes and nodded. He concentrated to keep from crying.

"Let's go home and you can lie down for a bit," she said, as if home were their home.

"I have to go back to my parents' house," protested Mattia, but without much conviction.

"I'll take you back later. Now you need to rest."

"I have to-"

"Shut up."

They got out of the car to swap seats. The darkness had taken over the whole of the sky, apart from a thin, useless strip running along the horizon.

They didn't say another word the whole rest of the way. Mattia trapped his head in his right hand. He covered his eyes and pressed his temples with his thumb and middle finger. He read and reread the words on the side mirror: Objects in mirror are closer than they appear. He thought about the article he had left Alberto to write. He was bound to make a mess of it; Mattia had to get back as soon as possible. And then there were lessons to prepare, his silent apartment.

Alice turned to look at him, worried, taking her eyes off the road from time to time. She was doing all she could to drive gently. She wondered if it would be better to put on some music, but she didn't know what he would like. In truth she didn't know anything about him anymore.

In front of the house she went to help him out of the car, but Mattia got out by himself. He swayed on his feet as she opened the door. Alice moved quickly, but carefully. She felt responsible, as if it were all the unexpected consequence of a bad joke.

She threw the cushions on the floor to make room on the sofa. She said to Mattia lie down here and he obeyed. Then she went into the kitchen to make him some tea or chamomile or anything that she could hold in her hands when she came back into the sitting room.

As she waited for the water to boil she started tidying up, frantically. Every now and again she turned to glance at the sitting room, but all she could see was the back of the sofa, its bright, uniform blue.

Soon Mattia would ask her why she had summoned him there and she would have no escape. But now she was no longer sure of anything. She had seen a girl who looked like him. So? The world is full of people who look alike. Full of stupid and meaningless coincidences. She hadn't even spoken to her. And she wouldn't have known how to find her again anyway. Thinking about it now, with Mattia in the other room, the whole thing seemed ridiculous and cruel.

The only certainty was that he had come back and that she didn't want him to go away again.

She washed the already clean dishes that were in the sink and emptied the potful of water sitting on the stove. A handful of rice had been lying on the bottom of it for weeks. Seen through the water, the grains looked bigger.

Alice poured the boiling water into a cup and dipped a tea bag in it. It gushed dark. She added two heaping spoonfuls of sugar and went back into the living room.

Mattia's hand had slipped from his closed eyes to his throat. The skin of his face had relaxed and his expression was neutral. His chest moved regularly up and down and he was breathing only through his nose.

Alice set the cup down on the glass table and, without taking her eyes off him, sat down in the armchair next to him. Mattia's breathing restored her calm. It was the only sound.

She slowly began to feel that her thoughts were regaining coherence. At last they slowed down, after dashing madly toward some vague destination. She found herself back in her own sitting room as if she had been dropped in it from another dimension.

Before her was a man whom she had once known and who was now someone else. Perhaps he really did look like the girl in the hospital. But they weren't identical, certainly not. And the Mattia who was sleeping on her sofa was no longer the boy she had seen disappearing through the elevator doors that evening when a hot, unquiet wind came down from the mountains. He was not the Mattia who had taken root in her head and blocked her path to everything else.

No, what she had in front of her was a grown-up person who had built a life around a terrifying abyss, on terrain that had already collapsed, and yet who had succeeded, far away from here, among people Alice didn't know. She had been prepared to destroy all that, to disinter a buried horror, for a simple suspicion, as slender as the memory of a memory.

But now that Mattia was there in front of her, with his eyes closed over thoughts to which she had no access, everything suddenly seemed clearer: she had looked for him because she needed to, because since the night she had left him on that landing, her life had rolled into a hole and hadn't moved from there. Mattia was the end of that tangle that she carried within herself, twisted by the years. If there was still some chance of untying it, some way of loosening it, it was by pulling that end that she now gripped between her fingers.