Each Day Soldiers book is different, and, in true trilogy fashion, each gets darker than the one before. Topia deals with an almost post apocalyptic world. Well, America at least. It's been a year since Travis bombed the country and the Day Soldiers have been hiding in their bunker, cut off from the outside world. When they emerge, they find a world who hates them, Humans and Vampires both.
Like the other two, the plot of this isn't clear from the outset, meaning much of the story is unpredictable. During the Day Soldiers last stand (which makes up the better part of a third of the book) you truly have no idea who will survive, or who will win. It is gripping stuff. And the question of whether Lily herself will survive to the end is as well handled as J K Rowling did with Harry in the Deathly Hallows. And just as exciting.
All the characters retain their individual brilliance, but my favourite part is a portion of the story where two of my favourites go on a mission together. Carl and Travis have such a chemistry, both hating the other and threatening to kill him, while still getting the job done. Travis is just brilliant in every scene he's in, but he's just wasted when he's not with Carl. If this were a TV show, those two would be most likely to get their own spin off.
There is a little niggle I have, though. From the first book, we have heard of the possibility of a 'good creature', and here, Abbie goes in search of one. While the philosophical questions raised may be interesting, what she is in search of is little more than a deus ex machina. Almost literally. But as with the destruction of the One Ring in the Lord of the Rings, it is the journey that matters. A deus ex machina is only really detrimental when not looked for.
The last book sowed seeds that come back here, especially with the concept of good and evil, and the question of whether the vampires have actually built a better world. The questions aren't fully answered by the end, and I'm glad Hale didn't try, but he has written a series which makes you think. Is humanity its own worse enemy? Do we need an outside force to enslave us to save the world?
All in all, a brilliant end to one of the best series I have read. I could mention the average writing again, but the quality of the story, the characters, the tying up of plot threads, the philosophical questions asked, all makes it irrelevant.
Put quite simply: YOU HAVE TO BUY THIS SERIES!