Bellis could picture it, and it moved her. She imagined the broken figure, sodden with brine and in the middle of a still-terrible storm, crawling to his feet, stumbling across the deck of his ill-prepared ship. Setting dying motors in motion, limping back across the sea hungry and exhausted, and above all alone.

"Do you think it’s the truth?" said Silas.

Bellis opened the book to its last section and held it out for him to see. The pages were crammed with strange-looking mathematic notations.

"The last twenty pages are taken up with equations, thaumaturgic notes, references to his colleagues. Aum calls it a data appendix. It’s almost impossible to translate. I don’t understand it-it’s high theory, crypto-algebra and the like. But it’s incredibly carefully done. If it’s a fake it’s needlessly complex. What he’s done… Aum has checked the details-of the dates, the techniques, the thaumaturgies, and the science… He’s worked out how it was done. These last pages… They’re an exposition, a scientific treatise, explaining how you’d go about it. How you’d raise an avanc.

"Silas, this book was written and printed in the last Kettai Vullfinch Year. That was twenty-three years ago. Which incidentally means that Tintinnabulum and his cohorts have it wrong-he thought Aum was writing in the last century. It was printed in Kohnid in Gnurr Kett, part of the imprint Shivering Wisdom. There aren’t too many Kettai works in this library, as you’d expect. And of those there are, the vast bulk are in Base Kettai. But there are a few High Kettai, and I’ve looked at them all. Shivering Wisdom publish in High Kettai: philosophy and science and ancient texts, gnostic mechonomy and the like.

"Shivering Wisdom obviously think this is on the level, Silas. If it’s a fraud, it’s taken in a scientific publishing house-as well, dammit, as the best fucking minds on Armada.

"What else are the Lovers’ scientists reading, Silas? My friend Johannes’ book Theories of MegaFauna. Another of his, about transplane life. Radical theories about the nature of water, books on maritime ecology. And they’re going crazy to find this little book here, probably because Tintinnabulum and his hunters have seen a few references to it, and they can’t damn well find it. Jabber’s sake, what do you think that’s all about?

"Silas, I’ve read this thing." She made him meet her eyes. "This is for real. This is a book on how to raise an avanc. And how to control it. The anophelius Aum writes about… the avanc broke loose from him easy." She leaned forward.