By Candlelight is a 1933 American Pre-Code comedy film directed by James Whale. The film is based on the Austrian play Candle Light by Siegfried Geyer and Karl Farkas. The film stars Elissa Landi, Paul Lukas, Nils Asther, and Dorothy Revier. A musical version adapted by Rowland Leigh, Cole Porter, Robert Katscher, and Edwin Gilbert premiered in 1938 under the title You Never Know, but was a critical and box office flop that closed after only 78 performances.