I get the impression that this book was banged out on a weekend by Mr Harris because some Hollywood studio wanted to cash in on the H-franschise and "base a movie on a novel". It reads like a screenplay and is therefore simplistic, especially if compared to its predecessor: Hannibal that left me enthrawled and in two minds whether to loath or admire (or both!).
Take it if you want the "whole picture", so to speak.