This little book describes the past, present and future of black holes through a funny and engaging story involving Grandpa Louie, his two grandchildren and two of their friends. During a beautiful sunny day on the beach, the children play, swim, enjoy their time, and ask a lot of questions to Grandpa Louie, a retired astronomy professor. Who better than him to tell all the secrets of black holes to a group of curious children? Who discovered them? What do black holes mean? Are There different types of black holes? How does a black hole form? What is his fate? How did scientists manage to observe these celestial bodies which, by definition, cannot be seen? At the end, we also bring up the subject of parallel universes, which could exist beyond the horizon of a black hole. This book is suitable for children from 6 to 12 years old.