The first day on the island brings danger and excitement. With the afternoon almost past, Bertie is the only one whose experienced no thrills. Biggles and Tom have found the yacht, narrowly escaped capture by Von Stahlein and are now on their way back to the plane. Ginger and Algy, striking overland in search of Hagen's papers have survived an attack by a wild boar, an even more murderous attack by Napoleon Morgan and now seem close to the hiding place of the missing plans...