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 curious train caboose in this illustrated chapter book series beloved by generations of readers. The Aldens take a train journey! And at every stop, someone has something to say about the train car the children are riding in. It turns out Caboose Number 777 has an unusual past—one that comes with its very own mystery! 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.