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Police sergeant Dave Wolfe (Skip Homeier) has already ordered Joe Oliver (Dale Van Sickel) to stay away from Dave's sister Susan (Chris Noel). Heading to Joe's apartment for a final showdown, Dave hears a woman's scream and breaks down the door. Several shots later, Joe lies on the floor dead, while the badly beaten Susan stands by in mute horror. In order to defend Dave on a murder charge and to find out whether or not Joe was really Susan's assailant, Perry Mason (Raymond Burr) must break through the wall of stony silence which surrounds the six people who may have witnessed the crime--but who claim to have seen and heard nothing.