I recently finished The Expanse, both the TV show (of which there are 3 seasons currently) and the most recent book. Both have continued to be excellent. One of these days I'd love to take like a week off work for the sole purpose of figuring out The Book of the New Sun. But I don't think that's especially realistic, at least not for the moment. I'm currently reading We Are Legion (We Are Bob), which is a good summertime read. It's fun, has some neat ideas, but isn't trying to be dense or brain-hurting. The premise is that a guy signs up for one of those services that freeze you after you die in the hopes that you can be revived with later technology. He is, but is brought back as a purely computerized entity, and then is put on a probe and told to explore space. It's generally grounded, problem-solving focused without too much hand-waiving of technology and the like. The main character is a bit of a Marty Stu, at least for your stereotypical nerd, but he's not so far into cliche that he's obnoxious (and the pop culture references are kept to a minimum, thankfully). I'm definitely enjoying it.
I was working my way through the Expanse as well, but at some point I got distracted somewhere in Cibola Burn and haven't gotten back into it. I can't recall what it was that made me stop but I should really get back into it. My partner and I blew through the TV Show and were itching for more so I picked up the books thus far.
The Expanse both books and series scratched a deep itch I've had since the second I finished The Martian. I really hope those showrunners and the writing team that adapted the series get some good source material for their next production because they captured that setting pretty damn well.
I do too. Thankfully the series isn't over yet: unlike with GoT, the books come out regularly, and are way ahead of the TV show. I think the series has covered maybe the first 3 books at most, while they published book #8 a couple months ago.