This challenge closed on 10/06/2020. See below for the correct answers.
In March 1937, in the wreckage of the Hindenburg the FBI discovered a small packet of documents. They carried a swastika and the legend “Die Alchemisten”.
The papers appeared to be nonsense and were ignored until 1939, when interest in all things German took on a new significance. A young intelligence officer called Philomena Black was tasked with analysing them but, with the cipher department fully engaged cracking signals intelligence from Europe, she had no resources to crack the code herself and called her friend Harry from the newly formed Bureau of Security and Signals Intelligence. Short staffed and in a race against time, they need your help to break the ciphers ...