The Perfect Woman (1920)

When Mary Blake applies for the position of personal secretary to misogynist James Stanhope, she is judged too attractive to accomplish the job. Mary returns home, makes herself unattractive and is promptly hired. Stanhope is assisting the government in the arrest of Bolshevists, and one night three revolutionaries enter the house, bind and gag Stanhope and put a time bomb under his chair. Discarding her unattractive disguise, Mary vamps the three into submission, clouts each on the head with a brass statue and saves her boss's life. Mary's resourcefulness forces Stanhope to give up his disdain for pretty women, and he proposes to his attractive secretary.