A sound of breaking glass comes from the toilets at school. Carlos, alarmed by the noise, rushes there and finds Esther Sánchez, the most perfect girl in the school, lying on the floor with a cut to her head. He is surprised to find, lying next to her, a strange object which he immediately puts into his pocket. From that moment onwards, Carlos will become caught up in a mysterious adventure, where nothing is as it seems. With elements of fantasy and incorporating a story of young love, this thriller poses questions about where the limits of science should be in today's society.