The Magician opens in a provincial German city at the turn of the twentieth century, where the boy, Thomas Mann, grows up with a conservative father, bound by propriety, and a Brazilian mother, alluring and unpredictable. Young Mann hides his artistic aspirations from his father and his homosexual desires from everyone. He is infatuated with one of the richest, most cultured Jewish families in Munich, and marries the daughter Katia.

They have six children. On a holiday in Italy, he longs for a boy he sees on a beach and writes the story Death in Venice. He is the most successful novelist of his time, winner of the Nobel Prize in literature, a public man whose private life remains secret.

He is expected to lead the condemnation of Hitler, whom he underestimates. His oldest daughter and son, leaders of Bohemianism and of the anti-Nazi movement, share lovers. He flees Germany for Switzerland, France and, ultimately, America, living first in Princeton and then in Los Angeles.