I am not really surprised that "Edge of Sanity" has only a few reviews.This film is pretty tough to find,which is no bad thing.Anthony Perkins plays here Dr Jekyll/Jack Hyde,who as a Hyde murders and mutilates hookers in Jack the Ripper style.The acting from the supporting cast is diabolical,only Perkins proving effective,mainly due to his cadaverous features and tormented demeanor.The idea of a split personality with a particular sexual dysfunction also works with this material.Unfortunately the killings are mostly off-screen,but still "Edge of Sanity" has a pretty disturbing and sleazy quality to it.Some scenes are downright weird and rather unpleasant,so be prepared.Check it out,if you're curious.6 out of 10.