If you are looking for a book that explains why there’s wreckage all over Jakku in The Force Awakens, then Empire’s End is the book for you! If, however, you are looking for information on where Leader Snoke and the First Order came from, well, you’ll hear somewhere between one to five percent of that story, tops. (Which to be fair, at least until the trilogy of movies is over, you had to know that nobody would be allowed too close to direct backstory, in case the writers wanted to do it on film instead. I mean, you had to know that, right?)
On the bright side, I’m still very much enamored of the characters in this trilogy, and it’s nice to see someone telling a full-sized story in the Star Wars universe where Skywalkers are relegated to a side role at best. (There have been other such stories prior to 2015, but really not very many.)
Just in case there’s confusion, I should note that the book does a lot more than explain Jakku wreckage. But it’s the third book of a trilogy, so why go crazy with spoilers? It continues to do well what the other books also did well: present a living, breathing galaxy reacting to Palpatine’s demise and the birth of a new Republic, while telling a personal story about several people on both sides of the lingering conflict. In other words, if you care about Star Wars, this has star warsy stuff worth caring about.