Edith Nesbit 
The Story of the Treasure Seekers [EPUB ebook] 

A deeply emotional and intriguing adventure novel and the author’s first book dedicated to children, Edith Nesbit’s The Story of the Treasure Seekers is an account of the attempts of six children to help their father and to get back the fortunes that used to be in the possession of the family.
When their father’s business fails, the six Bastable children decide to help the family finances by searching for treasure. But although they think of many ingenious ways to do so, their well meant efforts are either more fun than profitable, or lead to trouble.