Paul Muni managed to look anguished even when playing comedy, and Angel on My Shoulder is no exception. Muni has every right to be uncomfortable; a recently murdered gangster, he finds himself roasting in Hell. Muni can't believe that he's in for All Eternity and keeps trying to "bust out," which brings him to the attention of the Head Man (Claude Rains), who calls himself Nick. Nick strikes a bargain with Muni: There's a troublesome honest judge on Earth who's been shipping too many souls to Hell; if Muni will take over the judge's body and begin performing bad deeds, Nick will set him free. Muni readily agrees, eager to settle the score with the ex-partner (Hardie Albright) who bumped him off. Once he "becomes" the judge, however, Muni discovers that he is utterly incapable of performing any misdeeds--and when he falls in love with the judge's fiancee (Anne Baxter), Muni becomes determined to wriggle out of his agreement. Angel on My Shoulder is a dexterously clever comedy/fantasy, based on a story by Harry Segall, whose previous play Heaven Can Wait was filmed as Here Comes Mr. Jordan, with Claude Rains going against his diabolical grain as a Heavenly Emissary!