Given his personal history, I am loathe to acknowledge Roman Polanski as the director of "Rosemary's Baby". It sort of reminds me of an old comic book cliche; "Such a brilliant mind,it's a shame it is dedicated to evil". Polanski can direct, even if most of his films (Chinatown) are among the most overrated ever made.
"Rosemary's Baby" is as moody and surreal as they get. While one never doubts that Mia Farrow is onto something sinister, it nonetheless spirals to an inevitable conclusion. Mia Farrow gives her best performance as she suspects devil worshipers are trying to control her in the guise of her elderly neighbors, portayed by Ruth Gordon and Sidney Blackmer. She is consistently prodded to this view by her closest friend, portrayed sympathetically by Maurice Evans.
This is not a typical horror movie in that it is a sheer battle of wills to see if she can save her baby and herself from Satan worshipers.
Elisha Cook Jr, Ralph Bellamy and Charles Grodin have small but well timed roles that move the plot forward. This movie has dated somewhat, but still pays.