Mysteries entering the public domain.

Mysteries that have entered the public domain and are on the online Project Gutenberg:

A.E.W. Mason. NYPL

  •  As a Thief in the Night  by R. Austin Freeman (a Dr. Thorndyke mystery). "One of the most satisfactory detective stories we have read."—Walter R. Brooks, The Outlook

  • Ashenden; or the British Agent by Somerset Maugham (based on Maugham's experiences in World War I). "An urbane series of stories dealing with the diplomatic side of Secret Service work"—Saturday Review

  • Behind That Curtain by Earl Derr Biggers (a Charlie Chan mystery). "Excellent"—Gilbert Seldes, Saturday Review (pb edition here)

  • The Footsteps at the Lock by Father (later Msgr.) Ronald Knox (a Miles Bredon mystery). "breezy characterization and satirical humour"—The Spectator (pb edition here)

 • Murder in the Maze by J.J. Connington. "[T]he usual false clues are skillfully suggested, and the reading public may well be surprised and amused to the end."—The English Review (pb edition here)

 • The Prisoner in the Opal by A.E.W. Mason (an Inspector Hanaud mystery). "another intriguing story of mystery and thrilling adventure"—Wanganui Chronicle (Wellington, Australia; pb edition here)

 • The Velvet Hand: New Madame Storey Mysteries by Hulbert Footner. "thoughtfully and ingeniously constructed"—New York Times