Ellery Queen1975

Ellery Queen:
Do you know who killed Monica Gray? Now, if you've been watching closely, you have all the information you need. You know, for example, that it's not the father, because I proved him innocent - or did I? Maybe it's the mother, or the son, or the faithful secretary, or maybe somebody on the sidelines. But don't go too far afield. It's not my father. At least, I don't think it is. Well, good luck - you're probably way ahead of me, anyhow.