Summer of the monkeys
When Jay Berry sees a tree full of monkeys, nobody believes his story. Then a poster goes up, offering a reward for the capture and return of the monkeys, and Jay is determined to earn the reward money so he can buy a pony. The project makes for a summer of fun, thrills and danger, and, at the end of it, Jay must decide whether he buys his pony, or pays for a future for his sister.