When an elderly friend is injured, the Alden children offer to help him with his window-washing business in their small town of Greenfield and agree to help him solve a riddle that has arrived in a mysterious invitation.
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Details
ISBN: 0807554960 (lib. bdg.)
Physical Description:134 p. : ill ; cm.print
Publisher:Morton Grove, Ill. : Albert Whitman Co., c2002.