This is a seriously flawed book. If you liked Grady's earlier works, forget this one.
Grady is at his best when he describes settings and the people in them. You can tell that he enjoys doing so, or at least did in his earlier works.
In this work he evidently discovered the sentence fragment, the incomplete sentence, as a means of filling up pages perhaps to meet the requirements of a book advance from his publisher. Whatever the reason the result is page after page of fragments of thoughts and descriptions.
Used effectively, and rarely, a sentence fragment can be an effective tool. Used over and over and over it is the mark of a poor or lazy writer.
The sex scenes are also gratuitous and predictable. Another required element of the modern novel I suppose. But they add no depth to the characters or the plot.
Stick to his early work. Or find another crime novel author; there are plenty.