As promised, the latest book in the reread, Summer Knight, is the best in the series so far. While we’ve seen faeries in the Dresden Files before (Toot Toot and Lea, for example), Summer Knight delves more deeply into the Faerie denizens of the Dresden Universe, and their efforts to tangle Harry up in their web of schemes.
Summer Knight starts with Harry investigating a rain of toads. Billy the Werewolf (introduced in Fool Moon) sends up the Dresden Signal to Harry at the first sign of weird magic stuff and Harry responds. We learn that since the events of Grave Peril, the White Council is at war with the Red Court of Vampires and Harry’s become the target of several assassination attempts. Harry and Billy come under attack by some gunmen and a particularly vicious ghoul which gives them both a bit of trouble until Harry takes it down.