This book tells the story of Peek Platypus, who is having a peaceful evening swim in the river. Suddenly he sees a strange thing swishing through the water towards him and, before he knows it, he is being pulled out of the river. The 'Uprights', or humans, he meets think he is a valuable furry fish and decide to sell him to the nearby explorers, but they do not reckon on Denny Dingo who decides to rescue Peek. Will his plan succeed?