For me, this series really comes into its own in The Graveyard Game, the fourth book, where Joseph (the cyborg who recruited Mendoza) goes looking for his own recruiter Budu, a Neanderthal man who had been an enforcer for the Company. There's a mystery, and wheels within wheels (of course), and through it all reflections on what sort of love and what sort of duty Joseph feels toward both his pseudo daughter and his pseudo father.

Unfortunately the series really falls apart toward the end. I slogged my way through the whole thing, and there were still shining moments all the way through. It was a tough slog, though.