The Story of the Treasure Seekers by E. Nesbit
When their father's business fails, the six Bastable children decide to restore the family fortunes. 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...
Puffin Classics: 1995.
ISBN: 9780140367065. 256 pp.
Softcover. Very good.