An excellent read. This is the story of HM Submarine Seraph (HMS Seraph), a small S Class Submarine of the Royal Navy, and her exploits in the Mediterranean between 1942 and 1944. Known as the Secret Mission Submarine, she was involved in a number of unusual missions and it was an Anglo-American mission involving General Mark Clark where the boat had two captains for one mission - one RN and one USN. ( )