After accepting temporary work in a laboratory Cesar begins to notice strange events related to the treatment of a patient with the number 27, this disturbs him the extent of causing insomnia and hallucinations. Isela and Marcos, his coworkers attribute this to the Cesar fatigue, however the real reason for these views is more real and dangerous than they think.

Julian, a young man with mental problems kidnaps Montero, a corrupt doctor, to torture him so he could confess his sins.

A down-on-his-luck man discovers that his new apartment is inhabited by a self-absorbed ghost.