I figured immediately that Jack being the serial killer would pan out a red herring, that either Rick, acting in a fugue state, or the uppity morality cop Sidney would be revealed as the true perpetrator. I don't consider myself anything approaching a sleuth, so if I'm able to see your twist coming, you done fumbled the ball, son.
I suppose it was somewhat neat to see James Spader play a dual role as twins. It's hardly executed in a…