A man died in Jamaica, and in his safe was found a letter of commendation and a signed photograph from Hitler. This set up a chain of enquiries that involved the Jamaican police, MI5, and finally Biggles. It has been established that the dead man, known as Christian Hagen, was actually a former Nazi war criminal who had escaped from Germany with considerable cash and plans of the latest and most terrible of Hitler's scientific weapons. The latter cannot be found...