The Aldens spend their summer traveling in a houseboat! But when a black car shows up at every place they dock, the children begin to think someone is after something on the boat. Can the Boxcar Children figure out what the pursuer could be after? 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.