Another review of this said that you can read it without having read Pantomime and Shadowplay, but I’m not sure of that; I think I might’ve preferred to start with those two, after all. Still, it gives a nice taster of the world and some of the things that’re out there — and, I gather, some of the characters. I’m looking forward to seeing more of Drystan, and exploring this world more.
I did feel like I was at a disadvantage, though, not knowing the world already. You can pick up on the key terms/concepts — Vestige, Lethe, Drystan being the son of some high-class family — and maybe it’s just my love of world-building, but I felt like I wanted to know more before reading this, to appreciate it more, and maybe how it fits in with the novels.
Ah well, definite impetus to get on with it and read Pantomime and Shadowplay!