The plight of those in Murmansk and Archangel who benefited is now well known, but few are aware of the courage, determination and sacrifice of Allied merchant ships, which withstood unremitting U-boat attacks and aerial bombardment to maintain the lifeline to Russia. In the storms, fog and numbing cold of the Arctic, where the sinking of a 10,000 ton freighter was equal to a land battle in terms of destruction, the losses sustained were huge.

Told from the perspective of their crews, this is the inspiring story of the long-suffering merchant ships without which Russia would almost certainly have fallen to Nazi Germany.