"When you lose your dreams, you become a slave to your nightmares. That's why the world needs people... who aren't afraid to dream." Rebeca's parents have disappeared in mysterious circumstances and she has to go and live with her grandfather, Professor Balvatin, a man she hasn't seen since she was very little. Lost in a strange house with a cold and distant grandfather, she will discover that her parents' disappearance was not a coincidence and that she is in danger too. Her reality will crumble and she will find herself transported to a hidden reality, an age old secret related to her ancestors from the dawn of time, which will cause her to be hunted by unexpected and dangerous enemies. 'Mundo Sueño' ('Dream World') is a four-part fantasy series with the enchantment and magic of the best sagas, which reinforces the concept of fantasy as a value that can change reality and without which we would be lost.