The first installment in the over 200 book series that has sold over 80 million copies worldwide, and the first of the 19 books written by Warner herself, The Boxcar Children introduces the beloved mystery-solving siblings. Henry, Susan, Violet, and Benny are orphans trying to keep from being separated. When they find an abandoned boxcar in the woods, the Alden children decide to make it on their own, and the adventures begin.