During World War I, Germany's plan to control Europe has been thwarted on the battlefield. The Kaiser's government now intends to halt the torrent of supplies from America that are sustaining Germany's enemies. A crack team of saboteurs code-named The Black Spiders has arrived in the United States. Their mission is to destroy the factories supplying the Allied armies. The United States is neutral and unprepared for this type of attack. Can the Bureau of Investigations rise to meet the challenge before The Black Spiders spin their web of destruction around America?