When a woman is murdered, an inspector hunts for his nephew, who he believes is responsible for the killing. He sees a pattern of violence and rape develop as he interviews people listed in the suspect's address book.
Usually I don't give away the last ten minutes of a movie when I do these write-ups, but I have no problem making an exception in this case. Why? Because a) every other plot description of the movie I've read gives it away, and b) this is one of those movies you aren't watching for the plot anyway. Basically, the movie has the same gimmick as any version of THE HANDS OF ORLAC, only we're not talking hands. If you want a further hint as to the organ in question, let me just say right here that the movie emphasizes one of two possible uses for that organ, and had that movie emphasized the other use of that organ, it would've had a lot of footage involving urinals.
In short, it's a sex movie. Director Doris Wishman apparently made a lot of these. As for her directorial style, let me just make these observations. 1) You never know where the camera will point next, and 2) if you hear somebody talking, the camera will most likely be pointing at anything but that character's mouth.
Incidentally, the movie also has a really big moose head.