Contains: Sign of Four The mystery of Sasassa Valley -- The American's tale -- Our Derby sweepstakes -- A night among the nihilists -- Bones -- Elias B. Hopkins -- John Barrington Cowles -- The secret of Goresthorpe Grange -- The captain of the "Pole-Star" -- J. Habakuk Jephson's statement -- The great Keinplatz experiment -- The man from Archangel -- That little square box.