It is late at night when Mauro wakes up with a start, believing that an insect has entered his ear. Silvia, his wife, seems to have a strange bruise on his back, which Mauro believes is connected to the insect bite. After doing some research on the web, the man is convinced that he is the victim of an infestation of "Scleroderma Domesticus", a dangerous parasite. Mauro begins to put the apartment under control by waking up his wife, who will soon realize that her husband's state of paranoia hides something far more fearful and ruinous.