The young composer Max is due to marry Agathe, but before his wedding he must finish his opera on which he has been working for quite some time. Despite all his efforts, Max is plagued by worries that he will fail to complete the piece and so makes almost no progress. Visions and hallucinations haunt him, the boundaries between dream and reality seem to blur and overlap. Caspar tries to persuade him finally to give in to the hidden and dark creative powers within him and so overcome his inability to write; Caspar’s efforts are finally rewarded.