This time around Edward W. Robertson moves his story arc forward right from the start but he does it by mixing the old with the new as Walt returns to being a main character. There are two main story lines once again with Walt, who we know from Breakers, as the central figure of one and Raina, who was just a child when human civilization fell, as the central character of the other. Right from the start these two story lines offer different perspectives on the state of the Los Angeles basin as human factions vie for control of the area. If you haven't started the series and want to avoid any spoilers that reveal plot points from the prior books then you should stop reading now but know that this book is probably the best of the Breakers series to date because the story arc is finally moving forward, although things don't appear to going well for anyone.
Unfortunately for both sides, the bad guys from Catalina appear to be the only ones who care about the fact that the alien presence is still a threat to everyone and they are the only ones willing to deal with them. So you must decide if you want root for the Catalinans to get away with their mistreatment of other humans so that the aliens don't come out on top or if you want to root for the oppressed humans to rise up and put down the Catalinans, which likely means they will just be alien fodder. Which is all a real missed opportunity as the aliens in the area have become little more than refugees with advanced weaponry and they need to be addressed before it is too late.
Walt, who was not very likable at the start of the series, has become a different person and one that is now worth rooting for as he returns to the LA area. His reputation for alien fighting has become legend and he is sought out to help put them down while everyone else vies for power in the area. Meanwhile Raina, who essentially knows no world other than this broken one, has a very different perspective on things than those who experienced life before the apocalypse, and her growth as a character offers an interesting contrast to Walt. When these two main characters finally come together at the end it makes for some interesting decision making for everyone involved.
The series has a long way to go and it really could go in any direction. It isn't the best apocalyptic tale I have ever read, but it remains on the right side of interesting and it is worth continuing. If you enjoyed the first two books at all then there is no reason you won't like this one as well and If you haven't yet started the series then you might just want to consider listening over reading as the Breakers Omnibus edition on Audible includes the first 3 books and the prequel novella all for just one credit. With Ray Chase doing the narrating of all of these books it is a real bargain for sure.