(1) The Mysterious Island by
Jules Verne, (2) Gulliver's Travels by
Jonathan Swift, and (3) Treasure Island by
Robert Louis Stevenson. The three books all pertain to islands, and all three of the books shown in the film contain a partial map within the first few pages of the books. When the maps are placed on top of each other (with the compass points lined up to north) and a light is shone from beneath, the full map and coordinates of Verne's "Mysterious Island" are revealed.