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Four brave siblings were searching for a home – and found a life of adventure! Join the Boxcar Children as they investigate the mystery behind the wall in this illustrated chapter book series beloved by generations of readers.When the Boxcar Children find a mysterious journal hidden behind the wall of the guest room, it leads them on a search for a valuable coin collection. But what happened to the journal's owner, and what is she trying to tell them?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. The Aldens find a mystery when a visitor comes. Who put the coins in a hiding place behind the wall? A young Canadian visitor helps the Alden family solve a mystery involving a lost coin collection. I don't know what to do with myself," exclaimed Benny one day.