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® series continues to inspire children to learn, question, imagine, and grow.