Set in 1965, APARTMENT 7A tells the story prior to the legendary horror classic ROSEMARYS BABY, exploring what happened in the infamous Bramford building before Rosemary moved in. An ambitious young dancer (Julia Garner) dreams of fame and fortune in New York City, but after suffering a devastating injury, an older, wealthy couple (Dianne Wiest and Kevin McNally) welcomes her into their home in a luxury apartment building. After an evening she cant fully remember, disturbing circumstances soon have her second-guessing the sacrifices shes willing to make for her career as she realises that something evil is living in Apartment 7A.