A Voice in the Dark is a 1921 American black-and-white silent mystery film directed by Frank Lloyd and starring Ramsey Wallace, Irene Rich, and Alec B.

[1] The film is based on the play A Voice in the Dark by Ralph E. Dyar (New York, July 28, 1919).

They are both suspected of committing a murder when Sainsbury is found dead.

Blanche has a motive as Sainsbury almost dishonored her so that she wanted to prevent her sister from marrying him.

Thanks to the testimony of two witnesses, a deaf woman and a blind man residing in the sanatorium where Sainsbury was working, the murder is resolved: the culprit is Amelia Ellingham, a nurse whom Sainsbury had seduced and to whom he had proposed to marry.