The Boxcar Children: Surprise Island (Book 2)

If you're a child there is nothing more compelling than the idea of spending a summer alone with your siblings in a barn on an island. Add in cooking their own food, exploring the beach, finding the equivalent of hidden treasure, and a surprise cousin and you have Surprise Island by Gertrude Chandler Warner. 

Publisher's Summary:

"Four brave siblings were searching for a home – and found a life of adventure! Join the Boxcar Children as they investigate the mystery of Surprise Island in the second book in this illustrated chapter book series beloved by generations of readers.

The Aldens spend the summer on Grandfather’s island! Joe, the island’s friendly handyman, helps them with anything they need, but as the children continue to explore their summer home, they realize there is more to the island—and to their new friend—than meets the eye."