A science-fiction mystery series set not in the future but back in the year 1992.

Levante, 1992, at the end of summer in a town on the coast. Sandra, Eva, and Malena, three 15-year-old girls, disappear into a disco without a trace. The police do not seem to be looking in the right direction, so Sandra's little brother Javi launches an investigation with his best friends Quino and Álvaro, his best friends, and Zeta, the class bully. Together, they discover that those who have his sister and her friends are not of this world.