The Khipu and the Final Key (The Boxcar Children Great Adventure)
Written by Gertrude Chandler Warner with illustrations by Anthony VanArsdale

• Publication Date: October 1, 2017
• Genres: Adventure, Children's 7-10, Fiction, Mystery
• Paperback: 144 pages
• Publisher: Albert Whitman & Company
• ISBN-10: 0807506826
• ISBN-13: 9780807506820