I never read House of Silk, but I read his other Sherlock Holmes book, Moriarty. It was pretty good. I read Magpie Murders, which I liked a lot, very clever. It's my favorite of all his books that I've read. I also read The Word is Murder and I can't remember anything about it (not a good sign, I guess) but I think others really liked it.
I just read his prequel to Ian Fleming's 007, Forever and a Day and I enjoyed that.