00802cam a2200229 4500 121310304 TxAuBib 20060927120000.0 730403s1973||||||||||||||||||||||||eng|u 72013356/AC 9780807553640 0807553646 WaOLN TxAuBib Warner, Gertrude Chandler, 1890- Mystery behind the wall [HC] / Illustrated by David Cunningham. Niles, Ill. : A. Whitman, [1973] 127 p. : illus ; 21 cm. Her The Alden family mysteries A young Canadian visitor helps the Alden family solve a mystery involving a lost coin collection. 20060927. Her The Alden family mysteries.