Cloud Castles — Michael Scott Rohan

The Spiral: where past and present meet, where myth and legend infiltrate the mundane world, where Hy Brasil and Babylon are but a short voyage away - via the cloud archipelagos...

You can't always find it - but it can always find you.

And when it finds Steve Fisher again, he is plucked from his lonely life into the heart of a breathtaking adventure. An apocalyptic struggle that has raged for millennia must be resolved - or Fisher may see the dawn of a new Dark Age.