Arantxa trembles like a leaf, and Rati shrinks to nothing. Is it magic? Or is it the work of the sinister Mister Malasombra? Our friends will learn to master their greatest fear in this new adventure. And if you help them, you'll learn to master yours too! This story explains to parents and children alike that we all feel fear. In fact, from the moment we are in our mother's womb, we already feel the main emotions, among which, without a doubt, is fear. But we differ in how we feel it: intensity, frequency, duration, and the stimuli that trigger it. This story explains that almost all the fears our young children have share the same root: fear of losing the connection with us. This is why adults are so important and necessary when it comes to regulating children's emotions. The author of this story, Rafa Guerrero, holds a degree in Clinical and Health Psychology from the Complutense University of Madrid (UCM). He also holds a doctorate in Educational Sciences and is an expert in Educational Psychology. Master's degree in Brief Psychotherapy. Expert in trauma and EMDR. Expert in ADHD and learning and behavioral disorders. Director of Darwin Psicólogos and professor at the Faculty of Education of the Complutense University of Madrid. This book uses clear, simple, and engaging language and contains elements that help to understand the difficult situation the protagonist is going through.