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A strange sea monster suddenly appears on the lake...a fortune is unearthed from an old cannon...a valuable dinosaur egg is stolen. Who's responsible? Those six junior geniuses and their wild ideas. "Every time you Mad Scientists get mixed up in something, it means trouble!" cries the Mayor of Mammoth Falls. Watch out as the Mad Scientists' Club turns the town upside down.
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Book Description Scholastic Book Services, 1965. Condition: New. Charles Geer (illustrator). book. Seller Inventory # M059008559X
Book Description Scholastic Book Services, 1965. Paperback. Condition: New. Brand New!. Seller Inventory # VIB059008559X