Arabella is a talented fashion designer who has been struggling to make ends meet. She takes a job as a personal shopper for Marylin, a successful erotic novelist who lives in a luxurious apartment in the heart of the city. Arabella is thrilled to be working for someone so fascinating and stylish, and she starts to develop a close and intimate relationship with Marylin.
One day, while Marylin is out running errands, Arabella can't resist trying on some of the expensive garments in Marylin's closet. She is in the middle of admiring herself in the mirror when she hears the front door open. Panicking, she hides in the closet, where she can hear Marylin and an attractive man enter the bedroom. She watches as they make love on the bed and is soon turned on by what she sees.
To Arabella's surprise, this is not a one-time thing. Marylin has multiple lovers and Arabella becomes fascinated by her lifestyle. While she becomes accustomed to hiding in the closet and secretly watching Marylin's affairs, she begins to notice a pattern. Marylin always picks a certain day of the week for her rendezvous and has a routine with each of her lovers.
Arabella is intrigued by the excitement of being a part of Marylin's scandalous lifestyle but also struggles to come to terms with her own desires. When Marylin catches Arabella hiding in the closet, she admits that she knew what Arabella was doing and invites her to join in on the fun.
As their affair heats up, they begin to receive threatening messages from an unknown source. Someone knows about their relationship, and they will do anything to stop it. Arabella and Marylin must navigate their steamy affair while figuring out who is trying to destroy them.