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.

Prologue : "The Morelos will be ours" -- A simple business transaction -- "I will shoot you down like a dog!" -- The Alexander Agassiz -- For honor and fatherland -- "She is an outlaw and a dangerous enemy "-- "If you want to get the best of Uncle Sam, get up before you go to bed" -- "The Germans are after you" -- United States of America vs. Alexander Agassiz -- Going for broke.