When a young girl from a wealthy Mexico City family disappears, a man arrives to discuss the girl's return, asking for the confession of a family member that has committed a terrible act. One by one, confession by confession, the intruder exposes each member of the family, revealing their deepest and most shocking secrets.

As a poisonous dust cloud is heading towards their house, a mother and father will have to choose between sacrificing one of their three children or taking the risk of losing them all.