The combination of fantasy with more traditionally science-fiction elements in this story is unusual and completely absorbing. The world-building is skilfully done; Latent Emanation and Hathes come across as fascinating places, very different from the worlds we're used to, and expertly portrayed without a tiresome excess of detail. The character of Ari Ghairen is fascinating: he is a portrait of a man whose vices are formed by a society alien to ours, and whose personality has room for finer qualities alongside the skill at assassination and murder required by his profession.
I often feel that fantasy series can be drawn out over far too many books, but this is one where I feel there is ample room for more exploration of these worlds. I'd like to visit again, and discover more about the intriguing Ghairen and the development of Latent Emanation. This book definitely ends too soon!