A novel based on fact - an amazing story of daring and endurance. The slaughter of World War I was over, but already a new, more deadly war was beginning. In 1919 four British sailors were given orders to enter Petrograd Harbor, deliver a British agent into the heart of Soviet Russia, and then sink one of the Red Fleet's battleships. The weapons they chose were two small motor torpedo boats, the route - overland through snowbound, Communist-infiltrated Finland, then through the dark, icy seas and minefields that guarded one of the most impregnable harbors in the world.