Question: What was the German code name for the double agent that documented aspects of Faramus's ruse to join the Nazis?
Sentence (from "German weather ship Lauenburg"): Her capture and subsequent sinking on 28 June 1941 allowed the Royal Navy to acquire important German code books and parts of an Enigma machine, and came after the German use of such vessels had been identified as a weakness that could be exploited to break the Enigma code.
Relevant evidence: No