"While playing a game of Pirate's Eye high in the crow's nest, Percy spots two giant tentacles in the ocean! He and Piper work with Captain Sharktooth to figure out what the strange creature is."
Siblings Piper and Percy are excited to meet their mother's old friend, Seahawk Sally, and her son, Pennington, but when the pirate kids board Sally's multicolored ship, Pennington is less than friendly.