Every summer, Henri goes to visit his grandfather Jacques. It’s paradise there! Jacques lives in a charming seaside house, loves to cook, and knows the names of all the seashells. One day, when the sea is too rough for swimming, he explains the phenomenon of tides to Henri. Henri discovers that these water movements are like the waves of emotions that sometimes pass through him. Through breathing exercises, Grandpa Jacques teaches him how to tame his inner tides, so that his loved ones can discover his most beautiful treasures.