The slaughter of World War I was over, but 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 Fleets battleships. Their route was through snowbound, Communist-infiltrated Finland, to the icy seas and minefields guarding one of the most impregnable harbours in the world . .
