Incidentally, to the both of you: if you watch the story, there is a big clue as to the murderer - and the way the murder was done - in the first couple of minutes. And I shall be generous and give it to you: the second victim had drunk too much to be able to drive herself, yet she vanished from the place where she was supposed to be and was found in an empty lot. When you have seen the whole episode, you will go: 'YES!! THAT'S IT!!"