Inspector Héctor Castro arrives to take charge of the investigation into the doctor’s murder, while the patients face growing pressure as the situation becomes more unstable.

Ana Morantes is the next patient to be questioned, as fragments of a blurred and troubling memory begin to resurface during the investigation.

As Castro continues his interrogations, a dark secret begins to emerge, pointing toward a possible motive behind the crime.

Castro investigates the identity of one of the patients while questioning Fariba, uncovering inconsistencies in her story.

The revelation of the knight in Norman’s ceremony becomes a real threat to Doctor Marlow.

After all the interrogations, Castro is unable to prove which of the patients is the killer, forcing him to confront the limits of the case.