At the end of the last episode they set it up for Bosch and Maddie to branch out on their own and I believe there are a few series in the pipeline. Don't know if they felt they had taken Bosch as far as they could but the books branch out in different ways so there was certainly more material there. I really liked the way they intertwined the city and police politics in with the police cases, hopefully the new series can keep that aspect going. For those that liked Bosch, I can recommend Goliath with Billy Bob Thornton (also on Prime).