While investigating the death of a grotesquely disfigured man who might or might not have been pushed off a six-story building, Grissom (William L. Petersen) begins experiencing hearing problems. It soon develops that Grissom is suffering from hereditary otosclerosis, which may eventually lead to total deafness. Elsewhere, Catherine (Marg Helgenberger) investigates the point-blank shooting of a man in the parking lot of the bar which he frequented. ~ Hal Erickson, Rovi