he six Bastable children are plunged into grief when their mother dies and their father's business partner cheats him of all his money. As a result, he loses not only his fortune but also his good name. However, the children decide to lend a hand. Determined to restore both, the children set out to find some way of making money. A variety of amusing and exciting events follow as they plunge into a series of scrapes in search of a legendary lost treasure.