In Argentina, between 1982 and 1985, the Puccios, a well-established family of San Isidro, an upper-class suburb of Buenos Aires, kidnap several people and hold them as hostages for a ransom.
After receiving bad news, Natalia, a young novice, returns home, where her sister Ángela asks her to travel with her and her friends to a mysterious place.
Arachnids, is a synchronized swimming team made up of five teenagers girls. One day, Nina, the new team member, discovers a dark connection between her companions and a nest of tarantulas.
