She leaned against the wall, next to the stoup. As usual, her grey hair was plaited and she wore an old blue turtleneck that smelled slightly of sweat. She hooked her thumbs in the back pockets of her stained jeans.

"I was orphaned several times," she said. "And being an orphan means being a slave. Memories give you some security; you know who you are and where you're going. Or where you're not going. Without them you're at the mercy of the first person who comes along and calls you daughter. Don't you agree?" She waited for him to nod, and he nodded. "To defend one's memories is to defend one's freedom. Only angels have the luxury of being spectators."

Quart was thinking about die report on Gris Marsala that he'd received from Rome and that was now lying on his hotel desk, with certain paragraphs underlined in red. She had joined a religious order at eighteen. Studied architecture and fine art, at the University of California in Los Angeles, taking specialised courses in Seville, Madrid and Rome. A brilliant academic record. Seven years teaching art. Four years as director of a religious university college in Santa Barbara. A personal crisis, with health complications. Indefinite provisional dispensation from her order. Three years in Seville, where she earned her living teaching art students from the USA. Discreet, nothing special to report. She barely kept in contact with a local residence of the order to which she belonged. Living in private accommodadon. She hadn't requested to leave the order. The report didn't say whether she'd taken any computer courses.

Quart looked at the nun. Outside, in the square, the light was growing more intense and it was getting hot. He was grateful for the cool of the church. "So it's your recovered memories that keep you here."

"More or less." Gris Marsala smiled sadly, looking at the military medal tied to a wedding bouquet among the ex-votos, as if wondering who once held those flowers. "The Futurists," she said, "thought Venice should be blown up, in order to destroy the model. What seemed like a pretentious paradox then has now become a reality in architecture, literature… And in theology. Razing cities to the ground is an extreme example, a brutal way of hurrying things up. There are subtler methods."

"You and the others can't win this battle," Quart said gently.

"I and the others?" The nun was surprised. "We're not some kind of clan or sect. We're just people who have gathered around this church, each for their own personal reasons." She shook her head – it was obvious. "Take Father Oscar. He's young and has found a cause to fall in love with. It could just as easily have been a woman, or liberation theology. As for Don Priamo, he makes me think of that wonderful book, The Equinoctial Adventure of Lope de Aguirre by Ramon Sender, whom I heard lecture at the university. It's the story of a small, hard conquistador who limps from old wounds and is always in armour despite the heat because he trusts no one. Like him, Father Ferro is rebelling against an ungrateful, distant king and fighting his own personal battle. Isn't it amusing? Kings sent men like you to imprison or execute men like Aguirre." She sighed and was silent a moment. "I suppose it's inevitable."

"Tell me about Macarena."

On hearing the name, Gris Marsala looked closely at Quart. He bore her scrutiny. "Macarcna," she said, "is defending her own memories: a few mementoes, her great-aunt's trunk, and the books she read as a child that marked her deeply. She's struggling with what she herself, in moments of humour, calls the Buddenbrooks effect: the awareness of a dying world, the temptation to side with the parvenus in order to survive. The desperation of intelligence."

"Please go on."

"There's not much more to tell. It's all there for you to see." Gris Marsala pointed out of the door at the sun-filled square. "She inherited a world that no longer exists, that's all. She's another orphan clinging to the wreckage."

"And what part do I play in all of this?" He regretted it as soon as he'd said it, but she didn't seem to find it odd.

"I don't know," she said with a shrug. "You've become a witness." She thought a moment. "They're all so alone. I think they want you to understand, or, rather, they want those who sent you to understand. Just like Aguirre, who deep down wanted his king to understand him."

"What about Macarena?"

Gris Marsala considered the wounds on Quart's knuckles. "She likes you," she said simply. "As a man, I mean. I'm not surprised. I don't know if you're aware of it, but your presence in Seville gives everything a special quality. I imagine that she's trying to seduce you, in her own way." She smiled like a mischievous little boy. "I don't mean in the physical sense."

"Does that bother you?"

The nun glanced at him with curiosity. "Why should it? I'm not a lesbian, Father Quart. I say that in case you're concerned about the nature of my friendship with Macarena." She laughed. "As for men in general and good-looking priests in particular, I'm a virgin by vow and by choice."

Embarrassed, Quart glanced out at the square beyond the woman's shoulder. "What's going on between Macarena and her husband?" he asked.

"She loves him." She looked surprised, as if it was so obvious it needed no explanation. She smiled ironically at Quart. "Don't look like that, Father. It's obvious you don't spend much time in a confessional. You know nothing about women."

Quart went outside and the sun fell on his shoulders like a heavy cloak. Gris Marsala followed, skirting round a pile of sand and gravel, and stopped by the cement mixer. The priest looked up at the belfry covered with scaffolding, and his gaze stopped at the headless Virgin above the door. "I'd like to see your apartment, Sister Marsala."

"You surprise me." "I don't think so." There was a silence.

"I hate being called Sister Marsala. Or is that a way of making your request sound official? After all, you are proposing to visit the apartment of a nun who lives alone. Aren't you worried about what people will say? Monsignor Corvo, for instance. Or your bosses in Rome. Although of course you keep your bosses in Rome informed."

Quart didn't know whether to frown or laugh. In the end, he laughed. "It's only a suggestion," he said. "An idea. I'm trying to piece together the puzzle. Seeing how you live might help." He looked straight into her eyes. She realised that he meant it.

"I see. You're looking for clues."

"I am."

"Computers connected to Rome. That sort of thing." "Yes."

"And if I refuse, will you get in anyway, as you did with Don Priamo's quarters?" "How do you know about that?" "Father Oscar told me."

There was too much information circulating, thought Quart, annoyed. They all told one another everything in that strange little club. The only person who had to struggle for information was he. With the sun beating down mercilessly, he suddenly felt very tired; he was tempted to loosen his dog collar and take off his jacket. But he didn't.

Gris Marsala walked slowly round the cement mixer. "Why not?" she said at last with a thoughtful smile. "There hasn't been a man in my apartment in the three years I've lived there. It'll be interesting to see how it feels. I'll try not to throw myself at you the minute I shut the door. Will you defend yourself like Saint Maria Goretti, or will I have a chance with you? Although at my age I don't think I'd be much of a test of anyone's resolve. It's hard, you know, for any woman to realise that she's lost her looks for good." Her expression became harder now. "Especially for a nun."

"Make yourself comfortable," she said.

The irony was thick. There was little of comfort in the small sitting room of her apartment, on the third floor. The narrow balcony looked out on to the Calle San Jose near the Puerta de la Carne. It took them only ten minutes to get there from Our Lady of the Tears. With the sun beating down, the streets were like furnaces and the whitewashed walls dazzled. Seville was all light. White walls and light in every variation, thought Quart as he had walked with Gris Marsala, zigzagging in search of shade. It reminded him of when he and Monsignor Pavelic ran from shelter to shelter down the streets of Sarajevo, avoiding the snipers.