Shadowmarch was a 4 book series (Shadowmarch, Shadowplay, Shadowrise, and Shadowheart); a modern very long fantasy novel take on heroic adventure. It was quite successful. After the disappointments of Memory, Sorrow and Thorn I initially checked out only the first book, but it proved strong enough that I checked out and read the remaining books in the series.
They did not disappoint. Characters were stronger, varied, and interesting. It didn’t fall into the trap of introducing a multitude of less interesting viewpoints in later books; the major viewpoint characters were constant throughout the series.
Together, the characters explored the world–though not exhaustively, and never with a “just to show the next shiny city” motivation. The troubles that beset the characters are huge and transformative. Some of the storylines fade for a while, but that’s actually a good thing–the main through lines continue and you’re interested when the action finally gets back to the second string characters.