Whether he believed this excuse or not, he accepted it. He turned his left hand palm up, the back of the hand still lying on the stone, fingers curled up slightly as if he was about to cup a sphere. “Sorcery is a mental discipline, not a physical one. It is the manipulation of the unseen forces that surround us, that are always active, though they are invisible to our five senses. There are those who profess knowledge of the forbidden arts who use physical means, incantations, chants, and objects, to focus their minds and reveal knowledge beyond what is common. These we know by many names, depending on what elements they seek to manipulate. The tempestari try to control the weather; the haroli seek to call down the daimones of the upper air, who are almost as knowledgeable as the angels. The sortelegi cast lots and make predictions, and old wisemen and women who may yet remember the old gods and have not yet turned their hearts entirely to Our Lady and Lord make predictions by means of the flights and cries of birds. These we call augures. Even unlearned folk have among them those who by diverse means and complicated misunderstandings have some simple skill in magic.”

He paused and seemed to be waiting for her to comment.

The marble tomb at her left hand was engraved with the likeness of a woman wearing a biscop’s mitre and robes: Caesaria, deacon and biscop. In the carving, the biscop held a shield depicting a saint, a woman with arms outstretched holding a knife in each hand; she also wore, as the sign of her martyrdom, a knife buried hilt-deep in her breast—St. Kristine.

“But the church condemns some magi,” said Liath, “and watches with suspicion over any who are not sworn to its service.”

“True enough. The church does not approve of those who seek such powers without its guidance. There will always be people who use the arts only for their own gain or to harm others. These we call malefici. The worst among them are those who consort with devils by means of blood and sacrifice. But others also remain suspect, chief among them those we know as the mathematici, for the study of the heavens is derived from the arts of the Babaharshan magi and the church looks with disfavor upon arts known to be heathen in origin.”

And what of those who can speak a name and have it resonate across a great distance? This was not the first time she had heard that voice, calling her name, but obviously it must be the voice either of a magus or of some creature not of human birth, an angel or a daimone. Or a devil in service to the Enemy. She shuddered.

Wolfhere lifted a hand to touch her, briefly and reassuringly, on the knee. “You are safe with me, Liath.”

She said nothing. She did not believe him. He regarded her silently. Suddenly calm, she examined him: his grave expression; the stern light in his eyes which was, nevertheless, touched with kindness; the marks of age on his skin; and in his hair and beard, where only a trace of the younger man remained, a few strands of brown hair nestled among the silver.

It was not that Wolfhere might personally wish her harm; she did not believe that. But she suspected his ultimate ends. She suspected him of wanting her for some other purpose, one which he chose not to reveal to her. “Trust no one.” Even if he meant well by her, how could he protect her from the fate that had stalked Da? How could he protect her against a power that could strike death onto a man without unlocking door or window and without leaving a mark on the body? How could she protect herself?

Wolfhere laid his hand back on the stone. “But if the mind is properly trained, none of these other ways are necessary or even preferable. By what means do the magi focus and train their minds?”

“The ladder.”

He nodded. “‘The ladder by which the magi ascend.’ Can you recite it?”

She had tried so hard not to think of these things while she had been Hugh’s slave that it took her some little time to walk back through the city of memory, to mark the gates, the levels of the great city in which all her knowledge was stored. “There are seven rungs on the ladder, which correspond to the seven spheres of the heavens. First is the rose of healing. Then the sword of strength. The cup of boundless waters. The ring of fire, which is known to us also as the Circle of Unity, the symbol of our Lady and Lord who together form the God of Unities. The throne of virtue. The scepter of wisdom. And the Crown of Light, which we also know as truth.”

Wolfhere nodded. “These are the tools the magi use. Follow with me, in your mind’s eye. Through the ring of fire we may see a vision of another place.” He drew his hands farther apart and stared fixedly at the black stone.

Liath felt his silence reach a new and deeper level, as if he were drawing away from her, although of course he did not actually move. But she had never learned to build the ring of fire in her own mind; Da hadn’t taught her the mental exercises beyond the sword of strength. She stared at the expanse of stone that lay between Wolfhere’s hands, one palm down, the other palm up. Her grip tightened on the torch. The air itself seemed to grow taut. Wolfhere sucked breath in between his teeth. His pupils widened, then shrank to pinpricks as at a sudden bright light.