None but the Lonely Heart is a 1944 American drama romance film which tells the story of a young Cockney drifter who returns home with no ambitions but finds that his family needs him.

On Armistice Day, Ernie visits the tomb of the Unknown Warrior in Westminster Abbey, which memorializes those who died in World War I, including his father.

He meets fellow musician Aggie Hunter outside the bar, but instead prefers the company of a gangster's fickle former wife, Ada Brantline.

Ernie begins to notice the poverty surrounding him in London and chooses to accept Mordinoy's offer to join his activities, even against Ada's pleas.

[4] RKO Pictures head Charles Koerner bought Richard Llewellyn's book as a starring vehicle for Cary Grant.

To secure Ethel Barrymore's availability to complete her scenes, RKO had to pay all the expenses incurred by temporarily closing the play The Corn Is Green, in which she was starring on Broadway.

[5] Hanns Eisler, who was nominated for an Academy Award for composing the film's score, was also interrogated by the House Committee on Un-American Activities and was designated as an unfriendly witness for his refusal to cooperate.