Midway through the Second World War, both sides are hunting for the strategy that will finally break the stalemate. Allied commanders turn to strategic fire bombing, targeting German industry and cities from the air in an attempt to cripple the war machine at its source. Hitler answers by ordering his U-boats to sever the Atlantic supply lines keeping Britain and the Soviet Union armed and fed, betting that starving the Allies of materiel will do what battlefield victories have not. The film lays out this exchange of blows as a genuine turning point, where neither side has yet gained the decisive edge and each new tactic is a response to the other's last move. Archival footage and expository narration track the bombing campaigns and the convoy war side by side, framing the middle years of the conflict not as a foregone conclusion but as an open contest still being decided in real time.