While the Great War raged across the trench-lined battlefields of Europe, a hidden conflict took place in the distant hinterlands of the turbulent Mexican Republic. German officials and secret-service operatives plotted to bring war to the United States through an array of schemes and strategies, from training a German-Mexican army for a cross-border invasion to dispatching saboteurs to disrupt American industry and planning for submarine bases on the western coast of Mexico.

Bill Mills tells the true story of the most audacious of these operations: the German plot to launch clandestine sea raiders from the Mexican port of Mazatln to disrupt Allied merchant shipping in the Pacific. The scheme led to a desperate struggle between German and American secret agents in Mexico. German consul Fritz Unger, the director of a powerful trading house, plotted to obtain a salvaged Mexican gunboat to supply U-boats operating off Mexico and to seize a hapless tramp schooner to help hunt Allied merchantmen.

Unger’s efforts were opposed by a colorful array of individuals, including a trusted member of the German secret service in Mexico who was also the top American spy, the U.S. State Department’s senior officer in Mazatlan, the hard-charging commander of a navy gunboat, and a draft-dodging American informant in the enemy camp. Full of drama and intrigue.