different number combinations.) These frequent letters gave her a start, and when able to solve the code in full, Elizebeth identified the names of two known Nazi agents in Mexico, MAX and GLENN, who would appear in other messages in the future, linked to agents in the United States and South America. The two Nazi spies were reporting to Berlin on the movements of U.S. and British ships, making those ships vulnerable to U-boat attacks. Elizebeth solved their book cipher without needing to see the book and did the same with messages
