The only characters who I felt sympathy for were Ibrahim, Mahmoud, and Matteo, the baby. And you know the characters leave a lot to be desired when you find yourself feeling empathy for a guy who agreed to strap on a bomb!
First Kate, who was angry with Dexter for the fact that their son had a cold--and wanting to take a wine tour on and family trip--and the Lego! The darn Lego! Then she spent the rest of the book running around doing everything in her power to "save" him. I could just hear her, "Ugh, another day on the job, saving my dumb@$$ husband from himself."
Kate and Susanna/Julia were both dominant in their relationships.
Many of the characters were motivated by greed and payback (Hunter, Susanna, Bill, Dexter).
I suppose I can admit to understanding Wyatt's motivation- -his daughter and her illness. And I question whether he was as ruthless and "sociopathic" as he once was. (Does that really make a difference?) He didn't have the nerve any more. He didn't seem to be doing the job because he liked killing people, rather he had a responsibility to his daughter and did the only thing he thought he could to be able to afford her treatment.
As a whole, I felt this was a pretty unlikeable bunch. Personally, I find it difficult to fully enjoy a book (as in 4 or 5 star enjoy) if I am unable to connect with the characters.