Grinding my way through. I probably should have reread MHI first, there are so many references to backstory.
Series fiction is popular with writers as well as readers. They get to reuse characters they develop. Even more so in science fiction and fantasy, they want to get more use out of whole worlds already designed. The main problem there is that the challenges have to get more and more difficult to keep the characters busy and the readers interested. It can eventually get completely out of hand. QV 'Skylark of Valeron.'