In the midst of World War One, four sailors are charged with attacking Russia.
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 . . . .