“The art of the murderer… is the same as the art of the magician,” is a line in John Dickson Carr’s first novel It Walks by Night. It expresses the spirit of this book, and of many of the later mysteries Carr wrote over a long, prolific career. Carr was famous in the Golden Age for his locked-room mysteries, where, as in a magic trick, the question “who did it?” is often less puzzling than the question “how did they do it?” This book’s US copyright unlocks in 25 days. #PublicDomainDayCountdown