“Baby Ruby” (*1/2 out of four) was a stillborn suspense psychodrama about a young woman (Noemie Merlant) who becomes a mother for the first time with the title child and finds herself mentally unraveling. Is this post-partum depression or a sign of something more severe? Dour and drab movie covers all-too-familiar terrain from “Rosemary’s Baby”, “The Exorcist”, “The Shining”, and too many others to mention. Disappointing directorial debut for noted playwright Bess Wohl who is hampered by tired material.