A serendipitous convergence of talents in front of and behind the camera yielded standard-bearing female-centric psychological horror that even spooks via its (still-extant) NYC locations. Striving actor John Cassavetes and wife Mia Farrow score an Upper West Side apartment to die for; soon baby will make three, but her nerves are fraying—who exactly is the father? With Sidney Blackmer and Oscar-winning Ruth Gordon as the neighbors from, well…