J. Edgar Hoover has tasked skeptical Bureau Agent Miranda Keller and true-believer detective Tom Malone to investigate a rash of deadly bombings. Hoover wants them to pin the bombings on radicals, but the evidence is pointing to something more supernatural and sinister: The Great Old One known as “The Dunwich Horror”...and the white supremacist cult that sum-moned it. Can our heroes stop one, let alone both?