"That very afternoon my father and the cat went down to the docks to see about ships going to the Island of Tangeria. They found out that a ship would be sailing the next week, so right away they started planning for the rescue of the dragon."
Elmer Elevator befriends an ally cat who tells him of a mysterious island called Wild Island. The cat says there is a baby dragon there that is tied up and forced to carry people and cargo up and down the river. Elmer decides he will run away to Wild Island to save the dragon.
Elmer hides in a cargo ship and eventually makes it to the island. On the island he runs into many animals that block his path to the dragon. Elmer uses his supplies from his knapsack to help him get past the animals. For example, a lion has snarly hair so Elmer gives him a comb and shows him how to brush his hair and tie it up.
To cross the river, Elmer ties the crocodiles tails together with a band and a lollipop to form a chain. He runs across, but the animals chasing him get stuck in the middle of the river on the crocodiles backs. Elmer reaches the dragon, cuts him free from his rope, and together they fly away from Wild Island.