I don’t read much fiction, but I quite enjoyed the book Edge of Tomorrow was based on: All You Need Is Kill. The plots only overlap at a very high level, if that, so no worries on having it spoiled for you. It’s fun reading the protagonist’s thought process and I think the book does a far better job at making the aliens scary, the war desperate.
Your comment gives me the urge to create other maps you can comment on so that I can triangulate your position.