The Unguarded Hour (1936).

Franchot Tone, left, and Roland Young
in The Unguarded Hour

In The Unguarded Hour, Lady Helen Dearden faces a tough situation: if she testifies in a murder trial, the career of her barrister husband will be ruined. But if she doesn't, an innocent man will be convicted. Further complications include the implication of her husband in another murder and the threats of a blackmailer. Based on a play by Ladislas Fodor and directed by Sam Wood, the film stars Loretta Young, Franchot Tone, Roland Young, and Henry Daniell.

There also are some radio versions: a 1944 Lux Radio Theater production with Robert Montgomery, Loraine Day, and a reprise by Roland Young, plus a 1952 Theatre Guild on the Air version with Nina Foch and Michael Redgrave.