"Then I'll go by myself," Laila said. "You can't stop me, Rasheed. Do you hear me? You can hit me all you want, but I'll keep going there."

"Do as you wish. But you won't get past the Taliban. Don't say I didn't warn you."

"I'm coming with you," Mariam said.

Laila wouldn't allow it. "You have to stay home with Zalmai. If we get stopped…I don't want him to see."

And so Laila's life suddenly revolved around finding ways to see Aziza. Half the time, she never made it to the orphanage. Crossing the street, she was spotted by the Taliban and riddled with questions – What is your name? Where are you going? Why are you alone? Where is your mahram? – before she was sent home. If she was lucky, she was given a tongue-lashing or a single kick to the rear, a shove in the back. Other times, she met with assortments of wooden clubs, fresh tree branches, short whips, slaps, often fists.

One day, a young Talib beat Laila with a radio antenna. When he was done, he gave a final whack to the back of her neck and said, "I see you again, I'll beat you until your mother's milk leaks out of your bones."

That time, Laila went home. She lay on her stomach, feeling like a stupid, pitiable animal, and hissed as Mariam arranged damp cloths across her bloodied back and thighs. But, usually, Laila refused to cave in. She made as if she were going home, then took a different route down side streets. Sometimes she was caught, questioned, scolded – two, three, even four times in a single day. Then the whips came down and the antennas sliced through the air, and she trudged home, bloodied, without so much as a glimpse of Aziza. Soon Laila took to wearing extra layers, even in the heat, two, three sweaters beneath the burqa, for padding against the beatings.

But for Laila, the reward, if she made it past the Taliban, was worth it. She could spend as much time as she liked then – hours, even – with Aziza. They sat in the courtyard, near the swing set, among other children and visiting mothers, and talked about what Aziza had learned that week.

Aziza said Kaka Zaman made it a point to teach them something every day, reading and writing most days, sometimes geography, a bit of history or science, something about plants, animals.

"But we have to pull the curtains," Aziza said, "so the Taliban don't see us." Kaka Zaman had knitting needles and balls of yarn ready, she said, in case of a Taliban inspection. "We put the books away and pretend to knit."

One day, during a visit with Aziza, Laila saw a middle-aged woman, her burqa pushed back, visiting with three boys and a girl. Laila recognized the sharp face, the heavy eyebrows, if not the sunken mouth and gray hair. She remembered the shawls, the black skirts, the curt voice, how she used to wear her jet-black hair tied in a bun so that you could see the dark bristles on the back of her neck. Laila remembered this woman once forbidding the female students from covering, saying women and men were equal, that there was no reason women should cover if men didn't.

At one point, Khala Rangmaal looked up and caught her gaze, but Laila saw no lingering, no light of recognition, in her old teacher's eyes.

"THEY'RE FRACTURES along the earth's crust," said Aziza. "They're called faults."

It was a warm afternoon, a Friday, in June of 2001. They were sitting in the orphanage's back lot, the four of them, Laila, Zalmai, Mariam, and Aziza. Rasheed had relented this time – as he infrequently did – and accompanied the four of them. He was waiting down the street, by the bus stop.

Barefoot kids scampered about around them. A flat soccer ball was kicked around, chased after listlessly.

"And, on either side of the faults, there are these sheets of rock that make up the earth's crust," Aziza was saying.

Someone had pulled the hair back from Aziza's face, braided it, and pinned it neatly on top of her head. Laila begrudged whoever had gotten to sit behind her daughter, to flip sections of her hair one over the other, had asked her to sit still.

Aziza was demonstrating by opening her hands, palms up, and rubbing them against each other. Zalmai watched this with intense interest.

"Kectonic plates, they're called?"

"Tectonic," Laila said. It hurt to talk. Her jaw was still sore, her back and neck ached. Her lip was swollen, and her tongue kept poking the empty pocket of the lower incisor Rasheed had knocked loose two days before. Before Mammy and Babi had died and her life turned upside down, Laila never would have believed that a human body could withstand this much beating, this viciously, this regularly, and keep functioning.

"Right. And when they slide past each other, they catch and slip – see, Mammy? – and it releases energy, which travels to the earth's surface and makes it shake."

"You're getting so smart," Mariam said "So much smarter than your dumb khala."

Aziza's face glowed, broadened. "You're not dumb, Khala Mariam. And Kaka Zaman says that, sometimes, the shifting of rocks is deep, deep below, and it's powerful and scary down there, but all we feel on the surface is a slight tremor. Only a slight tremor."

The visit before this one, it was oxygen atoms in the atmosphere scattering the blue light from the sun. If the earth had no atmosphere, Aziza had said a little breathlessly, the sky wouldn't be blue at all but a pitch-black sea and the sun a big bright star in the dark.

"Is Aziza coming home with us this time?" Zalmai said.

"Soon, my love," Laila said. "Soon."

Laila watched him wander away, walking like his father, stooping forward, toes turned in. He walked to the swing set, pushed an empty seat, ended up sitting on the concrete, ripping weeds from a crack.

Water evaporates from the leaves – Mammy, did you know? – the way it does from laundry hanging from a line. And that drives the flow of water up the tree. From the ground and through the roots, then all the way up the tree trunk, through the branches and into the leaves. It's called transpiration.

More than once, Laila had wondered what the Taliban would do about Kaka Zaman's clandestine lessons if they found out.

During visits, Aziza didn't allow for much silence. She filled all the spaces with effusive speech, delivered in a high, ringing voice. She was tangential with her topics, and her hands gesticulated wildly, flying up with a nervousness that wasn't like her at all. She had a new laugh, Aziza did. Not so much a laugh, really, as nervous punctuation, meant, Laila suspected, to reassure.

And there were other changes. Laila would notice the dirt under Aziza's fingernails, and Aziza would notice her noticing and bury her hands under her thighs. Whenever a kid cried in their vicinity, snot oozing from his nose, or if a kid walked by bare-assed, hair clumped with dirt, Aziza's eyelids fluttered and she was quick to explain it away. She was like a hostess embarrassed in front of her guests by the squalor of her home, the untidiness of her children.

Questions of how she was coping were met with vague but cheerful replies.

Doing fine, Khala I'm fine.

Do kids pick on you?

They don't Mammy. Everyone is nice.

Are you eating? Sleeping all right?

Eating. Sleeping too. Yes. We had lamb last night. Maybe it was last week.

When Aziza spoke like this, Laila saw more than a little of Mariam in her.

Aziza stammered now. Mariam noticed it first. It was subtle but perceptible, and more pronounced with words that began with t. Laila asked Zaman about it. He frowned and said, "I thought she'd always done that."

They left the orphanage with Aziza that Friday afternoon for a short outing and met Rasheed, who was waiting for them by the bus stop. When Zalmai spotted his father, he uttered an excited squeak and impatiently wriggled from Laila's arms. Aziza's greeting to Rasheed was rigid but not hostile.