Piet Piraat discovers that the handsome pirate captain Marilyn has been petrified. With his friends he travels to a tropical island to save her.

The Scheve Schuit bumps at high sea upon an abandoned ship. It's the Wankele Walvis, which Neptunus cursed, turning its crew into stone statues, including legendary most-attractive pirate lady Marylin. Piet dreams of winning her heart by undoing the curse. hard-found clues indicate that requires sprinkling the blue from the rainbow over them. To get to it, they must make the ship fly with its unique mechanism, which only works on blue pearls, which they seek on enchanted Oyster island, with giant carnivorous plants. Stien is left behind, volunteering to mind the ship, but ponders sabotage, being jealous of Marilyn.—KGF Vissers

Piet Piraat, Stien Struis, Berend Brokkenpap and Steven Stil travel with the flying ship 'De Wankele Walvis' to a tropical island. They have to battle flesh-eating plants and a giant laughing oyster. They discover some petrified pirates, including the beautiful pirate captain Marylin. Piet Piraat falls in love with her and tries to save her.—Anonymous