Let's haunt a house / Manly Wade Wellman -- The Wastwych secret / Constance Savery -- Jimmy takes vanishing lessons / Walter R. Brooks -- The mystery of Rabbit Run / Jack Bechdolt -- The forgotten island / Elizabeth Coatsworth -- The water ghost of Harrowby Hall / John Kendrick Bangs -- The Red-Headed League / Sir Arthur Conan Doyle -- The treasure in the cave / Mark Twain -- The mystery in Four-and-a-Half Street / Donald and Louise Peattie.