Solid adaptation of Emlyn Williams' stage thriller with a terrific British cast led by Dame May Whitty; but Rosalind Russell is miscast as a dowdy spinster and Robert Montgomery is dreadful as a con man on the make. He can't do a British accent to save his life and is utterly out of his depth in a cast of actual Brits. Moreover, his character is supposed to be a charmer, as mentioned several times in the dialogue; and it's not in Montgomery's wheelhouse.