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Bill's current girlfriend Nancy Mason (Julie Parrish), an expert on pre-Columbian art, gives Bill (Brian Keith) a priceless, centuries-old artifact. Not knowing the item's value, the twins take it to school for show-and-tell--and of course immediately break it. In desperation, the youngsters fashion a duplicate of the artifact out of clay...and it is this "forgery" which ends up being displayed at the Wyndham Gallery and hailed by one and all as an authentic masterpiece!