Captain Konrad Bergman was assigned to take a U-Boat to Japan to get information on a new torpedo the Japanese had recently developed. The Gestapo attempted to assassinate him part way through the trip as he was not a party member and they were suspicious of his actions on an earlier voyage. A second attempt in Japan failed as well but he got to see the torpedo which was too long for any submarine in the world but he learned the Japanese had a backup plan this new weapon. Could he steal it and get it back to Germany?

One of series of novels about Bergman and the German Navy.

There is a lot of information about living and fighting on a German U- Boat. ( )