But Grace and her forebears were generous supporters of the house, and had been for generations. It was through her family’s influence that the house was committed to its strange and dark project, a secretive work centuries old. It was through Grace’s influence that James, who longed only for a life of scholarship devoted to the peace of Christ, found himself studying terrible weapons of war.

And it was through her influence, her peculiar desire to bring on the end of the world, that he had been dragged from his book-lined cell and been brought all the way across Europe to this desolate, prickly landscape. Her purpose was to sell her Engines of God to the King and Queen of Spain, and she had a copy of the Codex of Aethelmaer, and a summary of two centuries’ worth of its development, tucked in her bags.

James did not want to be here. But there was purpose in all things, he told himself. God would show him the true path through the strange experiences to come. He crossed himself and mumbled a prayer.

Grace watched him, hard-eyed, analytical, and she laughed. She was a vigorous, physical woman. Sometimes she stared at him, as if wondering what shape his body was under his habit. And at night, when they stopped in towns or taverns, she would come close to him, brushing past so he could smell her hair, and see the softness of her skin. James knew she felt not the remotest attraction to him, and that this was all part of her bullying of him. But he was unused to women, and his youthful body’s reaction to her teasing left him tormented. She made him feel crushed, pale and pasty and worthless, less than a man. And she knew it.

It was a relief when the caravan at last reached Seville, and James was able to get away from her company, if only for a short while. But Seville had its own mysteries.

The Guadalquivir reminded him a little of the Thames in London. Navigable from the sea, the river was crowded with ships, and the wharves and jetties were a hive of activity, where sailors and dockers, beggars, whores and urchins worked and laughed, fought and argued in a dozen languages - the usual folk of the river, James thought, just as you would find in London. Trade shaped the city’s communities too; Seville was home to officers and sailors who had participated in Spain’s explorations of the Ocean Sea, and there were Genoese and Florentine bankers and merchants everywhere.