Margery Allingham’s detective Albert Campion may be easy to miss at first sight. He’s not as familiar to American readers as sleuths like Lord Peter Wimsey (who he resembles in some respects). In The Crime at Black Dudley (1929), he’s one of several mysterious secondary characters, and not the one who solves the murder.

Campion takes over the lead in later books, including 18 more by Allingham. Mike Ripley continues his adventures today. In 21 days, maybe you can too. #PublicDomainDayCountdown