The direction could have been better...
...but overall this was a very fine old-dark-house mysetery, which kept me guessing right up to the very end -- and without the aid of those tiresome CGI's that make up 90% of the movies we see today.
There was a television production of this with Helen Hayes as the writer and Margaret Hamilton as her companion. There was a funny bit in which Hamilton says to Hayes, "I'm so scared my teeth are chattering," to which Hayes replies, "take them out and put them in your pocket."
EACH DAWN IS THE BEGINNING OF A NEW LIFE.