In a bleak attic in Munich, a German boxer is pounding the bags. His name is Jürgen "The Rock" Hartenstein. Once a champion, he is now aging and alone. The boxer eschews women, alcohol and any creature comforts, earning his meager living as a pub bouncer. With no manager standing behind him, he is forced to train in city parks and in a dark, seedy attic with his African trainer, Markus Kone. Every week he phones matchmakers in the U.S., because this former German middleweight champion has a dream: he wants to make a comeback. He needs a win against a US boxer to get back in the game, six years after massive losses forced him to retire. Finally, "The Rock" gets his chance in Philadelphia, where the odds are heavily against him. This is his only chance for a comeback.