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.
It is Mexico in 1915. Two sisters remain hidden in their father's hacienda. He has gone to the revolution. The sisters await his return, surviving in the dark. Being found out could mean his death.
