Henry likes to kill people, in different ways each time. Henry shares an apartment with Otis. When Otis' sister comes to stay, we see both sides of Henry: "the guy next door" and the serial killer.
Henry: Portrait of a Serial Killer contrasts the mundane and the domestic with the appalling. The tone doesn't vary at all, and it's not a pretty picture, but movies that burn their images into your consciousness like this one are very, very rare. It is admittedly hard to look, but this is a portrait that demands to be seen.
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Slant Magazine
Jeremiah Kipp
The film doesn't so much bring us closer to the serial murderer as it reminds us of our culpability as spectators.
McNaughton has made a film of clutching terror that's meant to heighten our awareness instead of dulling it. At the end, Henry is still out there among us. And he's no B-movie monster in a hockey mask. He could be the guy next door. This film gives off a dark chill that follows you all the way home.