Reese and Dean return for another exciting visit to the magical Erutuf National Park. The siblings arrive in the valley part of the park and meet a talking bison named Lamar. Lamar needs their help.

Can they work together while facing new challenges to protect this national park? Will they get some unexpected assistance on this mission? Can they guard the secret map from a new set of pirates?

Siblings Reese and Dean Walters love to watch online videos like many of their friends. Reese already has a dream of becoming a marine biologist who helps save sea turtles and other living creatures in the oceans. One day when Reese finds a new sea turtle video for them to watch, something mysterious begins to happen after she clicks play. As colors swirl around the siblings, Dean and Reese float into the air, twirling round and round until they land with a quiet bump on a beach. Moments later, they realize they are on a magical national park island where no one can see or hear them—except the sea turtle inhabitants. When Dean and Reese learn the sea turtles need their help protecting a secret map from pirates who want to take over the island, they must partner together to overcome obstacles while searching for the hidden map. But will they find the map before the pirates and return home safely? In this exciting tale, a wannabe marine biologist and her brother swirl into an online video to help sea turtles protect a magical national park from pirates.