The crew of the Golden Wing team up with the famed Brazilian captain of The Amazon Princess, Captain Corqui. They seek the priceless treasure found at the bottom of the sea. Along the way they rescue Honu the sea turtle who helps them in their treasure hunt.

A young Black Beak sets out on his seafaring adventures as a swab aboard a ship called La Casse Bateau. The ship is manned by a crew of nasty reptiles who treat Black Beak as a slave. After being washed overboard by a storm, Black Beak is rescued by the beautiful mermaid, Coquille. But their adventures do not end there. Coquille is attacked by a giant eel and would have been lost but for the brave efforts of Black Beak.

While in port waiting for their sails to be repaired, the crew of the Golden Wing receives an urgent message. Black Beak's love, the beautiful mermaid Coquille, has been kidnapped by evil iguanas. Honu the sea turtle has information that she was captured by Captain Degout of La Casse Bateau. This is the very same ship that held Black Beak slave as a young sailor. Our heroes must find and rescue Coquille before it's too late.