Four orphaned siblings, Henry, Jessie, Violet, and Benny, are running away to avoid being sent to live with a grandfather they've never met. They discover an abandoned boxcar in the woods and turn it into a cozy, inventive home. The children work together, using their skills and kindness to find food and help others, all while wondering about their mysterious grandfather. Their story is a heartwarming adventure about family, resourcefulness, and finding a place to belong.