Winter 1943. Teenagers Frank, Joseph, and Stephen are Royal Navy recruits embarking on their first mission during World War II. Their ship joins an Arctic Convoy bound for Russia, carrying vital supplies to the Soviet allies. Navigating a dangerous route between the Arctic ice and German bases along the Norwegian coast, they face relentless attacks from air and sea, as well as brutal cold and fierce storms. Amid these threats, will all three boys survive the journey home?