Four brave siblings were searching for a home - and found a life of adventure! Join the Boxcar Children as they investigate the mystery of a hidden cave in this illustrated chapter book series beloved by generations of readers. A rockslide strands the Aldens on a mountain! But being stuck on Old Flat Top isn't all bad. As the children wait for rescue, they discover that a secret cave has opened up--one that just might hold legendary treasure! What started as a single story about the Alden Children has delighted readers for generations and sold more than 80 million books worldwide. Featuring timeless adventures, mystery, and suspense, The Boxcar Children(R) series continues to inspire children to learn, question, imagine, and grow.