A Perfect Crime is a 1921 American silent comedy-drama film directed by Allan Dwan and starring Monte Blue, Jacqueline Logan, Stanton Heck, Hardee Kirkland, and Carole Lombard.

[2][3] Based on a short story published in The Saturday Evening Post on September 25, 1920, by Carl Clausen, the movie concerns the life of bank messenger Wally Griggs and his wastly different alter ego James Brown.

[4] A mild-mannered bank messenger named Wally Griggs lives a double life as James Brown, a wild and rakish adventurer.

He catches the eye of bank president Halliday, curious about his exploits, and of his coworker and only friend Mary, who is romantically interested in him.

Mary lost her fortune after trusting a swindler named "Big Bill" Thaine, who is now a district attorney determined to marry her despite her reluctance.