Mystery behind the wall /

A young Canadian visitor helps the Alden family solve a mystery involving a lost coin collection.

Bibliographic Details

Main Author:	Warner, Gertrude Chandler, 1890-1979
Other Authors:	Cunningham, David, 1938- (Illustrator)
Format:	Book
Language:	English
Published:	Morton Grove, Ill. : A. Whitman & Co., [1973]
Series:	Warner, Gertrude Chandler, 1890-1979. Boxcar children mysteries.
Subjects:	Mystery and detective stories.