The Bobbsey Twins on Blueberry Island is a children's book by Laura Lee Hope, originally published in 1922. It is part of the long-running Bobbsey Twins series, which follows the adventures of two sets of twins: Bert and Nan, who are eight years old, and Flossie and Freddie, who are four. In this book, the Bobbsey family goes on a vacation to Blueberry Island, a remote island in Lake Metoka. The island is known for its blueberry bushes, which grow in abundance, and the family plans to spend their time picking berries, fishing, and enjoying the great outdoors. However, when they arrive on the island, they discover that a gang of robbers is hiding out there, using an abandoned cabin as their headquarters. The Bobbseys become embroiled in the robbers' schemes when they stumble upon one of their hideouts, and they must use all of their wits to avoid danger and bring the criminals to justice. Meanwhile, Flossie and Freddie befriend a local boy named Tommy Todd, who introduces them to the joys of island life. They also discover a mysterious man who lives alone on the island, and they are determined to learn more about him. With plenty of action, adventure, and mystery, "The Bobbsey Twins on Blueberry Island" is a classic children's book that will delight young readers.