It's summer, and that means a family trip to visit Grandpa on the coast! Henry loves staying in the old house by the water; he loves listening to Grandpa's stories, watching the purple martins build their nests, and of course, keeping an eye on his baby sister, Adeline. After all, that's a big brother's responsibility! But with little Adeline getting bigger, is it time for Henry to learn the difference between protecting someone and loving them enough to let go?