True friendship can survive the deepest oceans and the biggest differences. Amos is a tiny, adventurous mouse who loves the sea so much that he builds his own little boat to explore the vast waters. But when he accidentally falls overboard in the middle of nowhere, he finds himself alone, treading water, and in desperate need of a miracle. That miracle comes in the massive shape of Boris, a gentle and enormous whale. Boris saves the tiny mouse, and as they travel together, they discover they have a lot in common despite their incredibly different sizes. They form a bond that is built to last a lifetime. Years later, a terrible storm washes Boris up onto a dry beach, completely helpless. Dive into this beautiful story to see how one small mouse must race against time to rescue his giant friend and return the biggest favor of his life.