A Perfect Crime (1921)

Wally Griggs, a timid bank messenger, lives another life as a dashing young sport whose tales of wild adventure interest bank president Halliday and romantically fascinate Mary, who has been swindled out of a fortune by Thaine, now district attorney. When Wally decides to hide some bank bonds and is arrested by Thaine, he sues for false imprisonment and wins back Mary's money. He then returns the bank funds, pretending aphasia, and decides to become an author.