Rosemary's Baby by Ira Levin

A classic tale of horror. Catholic Rosemary moves from the mid-west to New York where she marries Protestant Guy Woodhouse. Her family pretty much disowns her and the one person she can depend on falls into a mysterious coma when he tries to warn her of the danger she is in. Too late Rosemary discovers that the Bramford houses a coven of witches who want her baby. Her plans to escape or thwarted by Guy. Told her child is dead Rosemary becomes suspicious when she hears a baby crying, but when she is reunited with her child she realizes he is a monster.