From The Perry Mason TV Show Book
Sergeant Dave Wolfe warned Joe Oliver to stay away from his sister Susan. Now Susan’s been beaten up in Joe’s apartment, Joe’s been shot to death, and Dave is going to jail for the murder.

Dave swears someone knocked him out and used his gun on Oliver. Perry comes to his defense and soon learns that there were six other people in the building at the time of the attack on Susan. Not one of them tried to help her. Perry also learns that Joe Oliver was not the man who beat up Susan Wolfe. If Dave really did kill Joe, he killed the wrong man.