I was a little afraid of this book, as it seemed like it would be one of the Rebus "theme" or "cause" books. I needn't have been. While the cause that was dealt with is real and poignant, and we were given a good introduction to it, Rebus wasn't taken out of his element this time. I found I was able to believe the story, with not much more suspension of disbelief than usual. I was slightly more aware of the level of "everything ends up being related" than I've been in previous Rebuses, but it wasn't so bad.
I enjoyed Siobhan's treatment, as I have been lately. It's fun to see her as a separate individual and detective in her own right, rather than just Rebus's appendage or flunky.