Set in 1965 New York City, Apartment 7A is a prequel to the horror classic Rosemary's Baby. After a career-ending injury derails a young woman’s dreams of being a Broadway dancer, a peculiar, wealthy elderly couple offers her a rent-free apartment in their building, The Bramford. As the would-be dancer settles in, she is presented with a second chance at fame by an influential producer who also lives there. However, disturbing events and unsettling circumstances begin to unfold, leading the young woman to question the sacrifices she is making and to realize there is a sinister conspiracy at play in The Bramford.