This took a while to get going and then when the resolution happened it was over quite quickly.
I suspect that Possession is 9/10 of the law featured in thoughts with this book. *evil grin*
Felix Castor is investigating why a friend of his committed suicide and why a murder has all the hallmarks of a long-dead American serial killer. And also his friend Rafi is in danger of being handed over to experimenters, and everyone who likes him is starting to wonder why, as several of them get injured or dead, or at least an attempt is made. He has to gang up with some unsavoury people to get things done and stay alive.
Interesting but it just didn't engage me until I was into the last third.