The Amazing Impostor

The Amazing Impostor is a lost 1919 American silent comedy film starring Mary Miles Minter and directed by Lloyd Ingraham.
Plot.
As described in a film magazine, the daughter of the "chewing gum king" Joan Hope (Minter) has social aspirations, but is held back by the fact that her father manufactures gum. She meets a countess (Shelby) on a train, who offers to lend Joan her title for a week if she will hold a package for her. Joan accepts, not knowing that the "countess" is actually a thief and that the package contains stolen diamonds. Joan passes herself off as a countess at a big hotel, and detective Kent Standish (Forrest) begins to shadow her. The countess and her gang of crooks try to recover the package of diamonds, causing several entangling situations until Joan escapes with the detective, whom she has come to love.