Goalkeeper Josef Bloch is sent off after committing a foul during an away game. This causes him to lose his bearings, and he wanders aimlessly through the city streets and spends the night with the box-office attendant of a movie theatre.
The young knight Tristan is injured in a fight in Ireland and cared for by the beautiful Isolde. He falls in love with her, unaware that she is the daughter of the Irish king.
