It's nice to be back in Seattle, the rain, the cool weather, the shambling zombies. 
 This book again shifts protagonists to a sap dealer who has been sampling too much of his own wares. He ventures inside the walled city and gets wrapped up in the overarching plot threads from the prior books. 
 The story and characters shine here again, especially Rector's struggle with sap withdrawal in a city full of it even while he faces down his eventual fate if he succumbs to his cravings. The tale centers around the other two youths (Huey and Zeke) with more insight into each of their minds. 
 The story wraps up much of the Seattle setting for the series, and I'm eagerly looking forward to the final volume and it's revelations of the effects of sap on the larger world.