This is a flashback to when Hugo and his sister Allison were six. They stay at their grandparents house which gets flooded all the time and the ocean is now right off the back porch. Offshore there is a big tree that seems mystical and unreachable. But Allison decides to swim out to it. Hugo tries to talk her out of it but she goes anyway, and then disappears under the water. Hugo swims after her but can't find her and decides to just float and let fate carry him where it will. He finds her and drags her back to the house. We hear some about the special twin language they speak in each otehr's minds.