While they are making their trip to Marín with their parents, David, Jaime and Teresa are unconsciously preparing themselves for their adventure. Without knowing it, their curiosity about the legends and related mysteries will provide them with the necessary knowledge to cross the space-time gate they will find by chance. On their journey through space-time, they will revise their knowledge of their present and fantasy world, sharpen their inventiveness, and face unsuspected challenges to the point of endangering their own lives to save the “Kingdom of the Lake”.