Dark Invasion 1915 by Howard Blum

1915 Germany's Secret War and the Hunt for the First Terrorist Cell in America

Set in 1915, this gripping account chronicles a shadow war on American soil in which German covert operatives carried out a campaign of sabotage against munitions and shipping bound for the Allies—culminating in catastrophic blasts like the Black Tom explosion—while fledgling U.S. law enforcement and intelligence, aided by British agents and determined investigators, race to unmask the spy ring, dismantle its networks, and confront the diplomatic and legal fallout that reshaped early American counterintelligence.

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