After a divorced New York mother hires a nice old man to play Santa Claus at Macy's, she is startled by his claim to be the genuine article. When his sanity is questioned, a lawyer defends him in court by arguing that he's not mistaken.
Composer Robert Schumann struggles to compose his symphonies while his loving wife Clara offers her support. Also helping the Schumanns is their lifelong friend, composer Johannes Brahms.