At head of title: Gertrude Chandler Warner's The Boxcar children.
"Graphic Planet"--Copyright page.
Summary
Henry, Jessie, Violet, and Benny Alden are spending a week on a houseboat! Throughout the journey, the children have the feeling they are being watched--and they are. Someone wants something on their boat, and he'll stop at nothing to get it. Can the boxcar children figure it out before it's too late?"--Page 4 of cover.