Agent of the Iron Cross : The Race to Capture German Saboteur-Assassin Lothar Witzke during World War I

From Publishers Weekly: "Devotees of cloak-and-dagger intrigue will revel in this thrilling and complex account."
On January 16th Witzke and several confederates departed Mexico City for the U.S. border. After crossing 1500 miles of rugged territory, encountering bandits and other hazards along the way, Witzke reached Nogales. But unknown to the saboteur-assassin, the German espionage network in Mexico had been penetrated by Allied intelligence and one of his companions was a double agent.
The Witzke mission was the intelligence game played at its highest level - a plan for destruction on a massive scale, violent insurrection, and assassination, complete with master spies and double agents, diabolical sabotage devices, secret codes, and invisible ink. Meticulously researched and written in the style of an adventure novel, Agent of the Iron Cross is the first detailed account of this legendary espionage operation.