The Dolphin People — Torsten Krol

Shortly after the end of WWII, sixteen-year-old Erich Linden and his family have fled Germany and joined Erich's uncle, Klaus, in Venezuela, where they will begin a new life. But, en route to Klaus's outpost further inland, they encounter a storm and their plane crashes in the middle of the jungle. Stranded deep within Amazonia with no hope of rescue, they are discovered by the Yayomi, a violent and superstitious Stone Age tribe. The Yayomi believe the strangelooking foreigners are freshwater dolphins in human form--and the Lindens believe that as long as they can keep up the bizarre ruse they'll be safe. But the jungle is a dark, mysterious place, and no place for a family of sham dolphin-people who are ultimately left with only two choices: to escape or to die trying.