The Long War

The story is structured like this: various teams travel the Long Earth with different goals in mind.

Much of the conflict revolves around humanity and their ability to co-exist with trolls and other humanoids. The war in the title deals with the Datum government wanting to control humans on Long Earth worlds, since their departure damaged the economy.

Things don't rev up until the last 50 pages. I enjoy the light humor and writing style so much that I was willing to stick with it, but it can really try a reader's patience.