I just finished this one as well. I have read every one of Daniel Silva's books. This is not his best one and the stories seem a bit formulaic now. I think I like the earlier stories where Gabriel is more tense and he starts out the story restoring a painting.
I am reading a book of short stories by Henning Mankell that detail the beginning of Wallender's career. I've also been enjoying Ian Rankin's novels and I've now read almost all of Martha Grimes' novels. Her stories were a bit difficult to begin, but I now love many of the characters she's developed over the years.
I also have Chernow's US Grant in the car CD player for when I'm driving - Chernow is a wonderful author and Grant was an amazing man. I also loved Chernow's Hamilton.
I miss the Morse author (Colin Dexter) - I cried when Morse died on TV and then when I read the novel with his death. What an amazing character - flawed and yet very good at what he did, plus he had some interesting quirks with the Wagner opera music and the old Jaguar. I think the Endeavour series does a great job of giving some more back story, especially about the politics of the Thames Valley police, the different characters (and how/why Morse knew about them and their proclivities/strengths and weaknesses) and the car!
I also miss PD James. Adam Dalgleish was such an interesting character and her earlier stories of a female detective were excellent as well.
Although I am a very American person, I think the British do a much better job at times of writing detective novels (although Connelly, Reacher and Simenon are definitely worthy) as well as acting/producing the detective series that we see through PBS. I sense that they have a depth of education in their history and writing that we miss out on in America.
For American writers, my all time favorite is Willa Cather with Benjamin Franklin, Mark Twain and Robert Heinlein close behind. I like my American writing direct, terse and succinct. I think it does a great job of explaining an American character which is different from the many other different cultures I've had the pleasure of living in.
Last digression - American science fiction is the best and the TV shows we've put together riffing on many different themes have been excellent. Elizabeth Moon and David Weber have some excellent space operas with military themes that I enjoy immensely. My favorite Heinlein book (he became a bit weird toward the end of his life) is Starship Troopers and that is mainly because he has a lot of philosophy in that book. I did not see the movie and probably won't as I find American TV and movie directors exercise a lot of 'artistic' license and many times pervert the author's intent to the director's intent. The British don't do that very often with their TV adaptations of books. Bosch is one of the few American TV series derived from an author's books series (Connelly) that did a great job of getting the author's intent and the book's characters accurately depicted.
OK - back to reading
