This book had a very interesting plot, which kept me reading. However, the writing style itself leaves something to be desired. The author goes out of his way over and over again to repeat traits explicitly, telling his audience instead of showing them.
He frequently informs the audience that the main character loves dogs throughout the book, which is obvious because he's protecting dogs and runs a dog shelter foundation; there is no reason to literally say, "I love dogs."

It's full of things like that, like when two bad guys are arguing and one of them refuses to pay the other one. "Jerry was now annoyed. 'That's bullshit.'"
Why did he have to inform us he's annoyed? Obviously he would be upset when someone refused to pay him for a hit. If that wasn't enough evidence, he said bullshit as well.

The dumbed down manner of spelling everything out and lack of character development drove me crazy. But I enjoyed the plot enough to finish it anyway.