The Boy on the Porch by Sharon Creech

I read this in one sitting.  Ms. Creech is an amazing writer.. .she can create a powerful story that is short yet well developed.
John and Marta wake up to find a boy on their porch who cannot speak.  There is a note in his pocket that asks the couple to keep the boy until the person returns.
A lesson on loving and giving generously even though you know there may be pain and heartache.