Absolute recommendation for Expanse novels by James S. A. Corey. If author sound's unknown, it is because it's a pen name of writers - Daniel Abraham and Ty Franck, guys who worked for years with RR Martin on some GOT related works (comic books, graphics novels, games) and second one as his assistant on GOT series. A real Space Opera, something I didn't expected at all. Actually, last hard sci-fi book that took me so completely was Ringworld series by Niven, and that was centuries ago :)
PS. As always - do not watch TV Series before read it, it's good but nowhere near books.

PPS. Prve cetiri knjige su prevedene kod nas od strane Lagune a peta treba da se pojavi ovih dana ;)