The Boxcar Children Set Series by Gertrude Warner Lot of 6 Books #11 - #16 is a collection of English-language paperback books written by Gertrude Chandler Warner. The series follows the adventures of four orphaned siblings who live in a boxcar and navigate through various challenges and mysteries in their young lives. The engaging and heartwarming stories are perfect for children and fans of classic children's literature looking for wholesome and entertaining reads.