The Fatal Warning is a 1929 mystery silent film serial directed by Richard Thorpe for Mascot. The film is considered to be a lost film, with no prints known to exist. It co-starred Boris Karloff.
After William Rogers, a bank executive, disappears, he is charged with embezzling money from the bank. But his daughter Dorothy asks her criminologist friend Russell Thorne to help her find her missing father and restore his good name.