Full disclosure: I love Seanan McGuire's work, and can honestly say I have never read anything she's published - including her work as Mira Grant - that hasn't been outstanding. That has not changed with Middlegame.
I will admit I was a little hesitant about this one at first. I'm a huge October Daye fan, crazy for Incryptid and in love with the Wayward Children books, but this wasn't tied to any of those settings, and I had this irrational fear that I might be disappointed. Oh me of little faith...
Middlegame is a complex tale, and it's more than a little creepy. Roger and Dodger are amazing characters, and amazingly normal, even as weird things begin to happen. The villains are monsters, literally and figuratively, and Erin, well she's probably the most complex character of all. She's at times funny, at times melancholy and always, always scary, and in the end, I wept for her.
Middlegame is one of those stories I will be reading again and again, and I highly reccomend it.