Putting One Over (1919)

When a train crash kills Horace Barney, the heir to a fortune that his doctors and guardians were planning to extort the unscrupulous trio quickly substitute his double Jack Trevor who by chance was on the same locomotive but knocked unconscious. Once awakened, Jack realizes the duplicity but plays along to try and foil the plot and save the estate for Barney’s cousin Helen who is the true heir and with whom he has fallen in love.