Amazon picked up the series for a 4th season after it was to be dropped by Syfy. And it’s renewed for season 5.
Hundreds of years in the future, the Solar System has been colonized by humanity.
The three largest powers are the United Nations of Earth and Luna, the Martian Congressional Republic on Mars, and the Outer Planets Alliance (OPA), a loose configuration of the asteroid belt and the moons of Jupiter and Saturn.
In season 4 there is a potential land rush to NEW habitable worlds. Possibly. If they can find a way through the Ring.
The 4th season is getting great reviews.
Personally I found it a bit slower than the previous three. Less action.
Wes Chatham as Amos Burton is my favourite character.
Click PLAY or watch it on YouTube.
Thomas Jane as Joe Miller, a Belter detective is great, as well. Actually, all the Belters are interesting.
Cas Anvar as pilot Alex Kamal is engaging.
Frankie Adams as Martian Marine Corps Bobbie Draper is true to the bad ass woman in the book.
I am getting sick of Chrisjen Avasarala, the United Nations Security Council boss.
Rick McCharles 
Yea, the 4th book is a bit of a setup for the next major arc of the story. I’d recommend reading/audiobooking the series. It’s worth it and soon to conclude with the final book.