The Million Dollar Mystery is a 23-chapter film serial released in 1914, directed by Howell Hansel, and starring Florence La Badie and James Cruze.

After the opening title card shows "hundreds of hands" grasping for the money and then a shot of the check for $10,000 the solver of the mystery is shown prior to the beginning of the first reel.

Baby Florence is left at a boarding school with a note and half a bracelet instructing that her father will come to take her back upon her eighteenth birthday.

Hargreaves, here played by Alfred Norton, is chased by the Black Hundred, but he receives a note and money before attempting to escape by balloon on the top of a building.

[2] Thousands of letters were received by Thanhouser in response to this promotion, and Ida Damon, a secretary in St. Louis, Missouri, won the prize.