Zaid is a successful heart surgeon with an expensive apartment and pregnant girlfriend. One night he gets a visit from his brother Yasin, who is desperate for money, but he refuses. Soon after, Yasin is found beaten to death and Zaid is overcome with guilt. As guilt gives way to anger, Zaid becomes a masked avenger and takes on Copenhagen's criminal underworld in his quest for justice.

Combining the exultant sweep of epic period drama with the subtle intimacy of biography in a social perspective, this is a tale of materially impoverished childhood, struggling early manhood and an unrequited first love turned into good musical fortune for Carl Nielsen, one of the great composers of the 20th century. Based on the composer's autobiography, the film itself is designed to soar like a symphony.