If you like the Bosch books, I think the "Inspector Rebus" series from Irish author Ian Rankin is worth checking out. I'm about 12 books into the series, more or less, and enjoy it. (Some more than others, but it's a good series, you can enjoy the development of the writing and the fleshing out of the character, etc.)
Give it a try.
Also, @mmc45414, if you want to read a great novel about the Vietnam war, get "Matterhorn" by Karl Marlantes. You won't be disappointed. Trust me.