The Potawatomi Boy

Green Leaf's cousins are all older than he and don't like to play fair. He longs for a friend his own age to go fishing and exploring with him, and to play games. When he meets a Luxembourger boy, Henri, Green Leaf is sure they could become friends, but Henri's words are strange to Green Leaf. How can they play and explore together? Green Leaf's mother says "Friends learn to say one another's words."
But will Green Leaf learn to speak his friend's words well enough to save Henri when he falls into danger?