Mr. Binnacle sends Dune and friends to the inlet to try to spot Buster, an endangered sea turtle whose tracking device is faltering.
The search takes the kids through several coastal habitats and leads to encounters with some of the island’s native inhabitants: a gopher tortoise, pelicans, fiddler crabs and a Portuguese Man-o-War.
When Jordi finally catches glimpse of Buster off the jetty, he also spots fishing line on Buster’s flipper. Dune realizes that Buster could be injured and in need of medical help. Can the kids get to Buster in time to save him?