Boy on the Porch by Sharon Creech
Book description from Amazon.com...When a young couple finds a boy asleep on their porch, their lives take a surprising turn. Unable to speak, the boy, Jacob, can't explain his history. All John and Marta know is that they have been chosen to care for him. And, as their connection and friendship with Jacob grow, they embrace his exuberant spirit and talents. The three of them blossom into an unlikely family and begin to see the world in brand-new ways.
My 25 cents...I could not put this book down. I wanted to know where this boy came from and who was coming back to get him?!! I could tell that John and Marta were becoming attached to him and whatever the reason was that he appeared must have been for because they were such kind people.
It's a SHORT read...a good "what if it happened to you--what would YOU do" kind of story!