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Publisher: Albert Whitman & Company
Published: Dec 1969
Genre: Children & Young Adults Fiction - Mysteries & Detective Stories
Retail Price: $6.99
Ages: 09 - 12
While visiting their grandfather at Mountvale College, the Aldens meet Mark Jacobs, an astronomy student, who tells them about a discovery he has made that he will soon announce to all, but when his paperwork suddenly disappears, the Aldens find themselves getting involved. Simultaneous.