In chapters 8, 9, and 10: Harry will pass off his werewolf report to Agent Denton, and receive a wild goose chase in return.  Upon reaching the Fool Moon garage, Harry bumbles the interrogation and instead of leaving with answers, he leaves with more enemies.  Finally, Marcone confronts Harry and offers him a deal, but is forced, instead, to accept Harry's counter-offer.  This is how Harry learns of MacFinn and the Northwest Passage project.

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Reddit Discussing QfB: https://www.reddit.com/r/dresdenfiles/comments/1lxi34f/what_mortal_magic_feels_most_like_an_outlier/