My father recommended this series to me. He also mentioned, after I had already started this one, that the characters get better formed in the later books. I might get to them, but since there are something like 120 books on my "to read" list and this book didn't have me longing for more, it might be a while.
The book itself was an interesting story and an interesting twist on the typical mystery - the main character was a member of the Israeli intelligence office of professional assassins. So while you got an interesting fictional story, you also got to read about Israel, terrorism and art (he is also a restoration artist).
I was compelled by the story and enjoyed the plot, but I didn't find myself caring about the characters very much. I wanted to know what happened, but almost so I could just finish it and pick up a different book. I could see myself reading some of his other novels when I need a good quick mystery, something to change up the flavor of what I'm reading.