Walter Forde directs this 1930s crime thriller based on the play 'The Ringer' by popular mystery writer Edgar Wallace. The film follows the desperate search for a killer known as The Ringer, who is as elusive as he is deadly. A master of disguise, The Ringer is rendered even more dangerous by the fact that he appears to be avenging the death of his sister and toys with his victims, despatching a note to a lawyer informing him that he will be killed within two days. Police doctor Lomond (Patric Curwen) finds himself caught up in the search for The Ringer, headed by Inspector Alan Wembury (John Longden). Will they manage to stop the killer before he strikes again?