The Keeper tells the incredible true story of Bert Trautmann (David Kross), a German soldier and prisoner of war who, against a backdrop of British post-war protest and prejudice, secures the position of goalkeeper at Manchester City, and in doing so becomes a soccer icon. His signing causes outrage to thousands of fans, many of them Jewish. But Bert receives support from an unexpected direction: Rabbi Alexander Altmann, who fled the Nazis. Bert's love for Margaret (Freya Mavor), an English woman, carries him through and he wins over even his harshest opponents by winning the 1956 FA Cup Final, playing on with a broken neck to secure victory. But fate will soon twist the knife for Bert and Margaret, when their love and loyalty to each other is put to the ultimate test.