The continuing adventures of Henry, Jessie, Violet, and Benny as they spend the summer on their grandfather's private island.

During the Great Depression, the Boxcar Children, a group of orphans, find shelter in an abandoned boxcar. As they make it their home, they stumble upon a hidden secret that leads them on an adventure to uncover the truth. With the help of their self-sufficiency, hard work, and determination, they overcome challenges and learn the importance of trust, family, and resilience.