The slaughter of World War I was over, but already a new, more deadly war was beginning, and four men were needed who were prepared to die...In 1919, four British sailors were given orders to enter Petrograd Harbour, deliver a British agent into the heart of Soviet Russia, 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 harbours in the world.