On the whole, Turn Coat is about the problems in the wizarding world that Butcher’s been giving hints about and glimpses at for a while now–and they come into focus in the most surprising of ways–Morgan asking Harry for help.
There’s just so much good stuff to be mined from Harry helping Morgan hide from the Wardens, deal with the Merlin (and others at HQ), investigate a murder/frame-job–it’s almost a shame to see Butcher wrap it up in 400 pages, because I’d love to get more of it. Great stuff.
In addition to all that, we see three important relationships forever altered in important ways (well, maybe one’s only temporarily altered, time will tell)–some good long-term character development for our pal Harry and his gang.
So, so good–Butcher had the ol’ brain firing on all cylinders for this one.