In the midst of WWII, following Germany’s invasion of the Soviet Union, a convoy of 35 civilian cargo ships from around the world embark on a journey to bring vital military supplies to a Norwegian outpost under the protection of Allied naval vessels. When the leader of the convoy decides to proceed through treacherous, enemy infested waters despite the recall of their military escort the supposedly safe expedition turns deadly. Fighting for their lives against merciless German air and naval attacks, the civilian merchant ships brave brutal Arctic seas to bring critical support to soldiers on the front lines. Caught at sea without defense or war experience, courage becomes their only lifeline.