After suffering a miscarriage, Rosemary and Guy (
Zoe Saldaña and
Patrick J. Adams) Woodhouse leave New York City for Paris, hoping to make a fresh start. A series of serendipitous events lead them to befriend affluent couple Margaux (
Carole Bouquet) and Roman Castevet (
Jason Isaacs), who invite them to live in their prestigious apartment building. While Guy appreciates Roman taking him under his wing, Rosemary is overwhelmed by the Castevets' interest in their lives. She finds evidence of the previous couple who lived in their apartment, and after going to Commissioner Fontaine (
Olivier Rabourdin) with her suspicions, learns that the woman, Nena (Victoire Bélézy), died by suicide. Following a lead, Rosemary finds Nena's priest, who tells her the apartment building has a dark past, and one of the tenants is a Satanist billionaire named Steven Marcato who eats women's hearts. The priest hangs himself soon after, which prompts Fontaine to investigate. When Guy's career flourishes, he suggests to Rosemary that they try to get pregnant again. On the night they plan to conceive, Rosemary drinks Margaux's herbal brew and passes out. In a dreamlike state, Rosemary sees herself being raped by a strange man, while being watched by Guy, Margaux, Roman, and the Castevets' friends. Weeks later, Rosemary learns she is pregnant, but her health deteriorates and she is neglected by Guy, who is reluctant to touch Rosemary and has been spending more time with Roman. Guy is angered when he learns Rosemary went to visit another doctor, as encouraged by her friend Julie (
Christina Cole). Guy visits Julie and secretly takes her crucifix necklace; not long afterward, Julie dies in a kitchen accident. Rosemary's pains suddenly disappear, and the rest of the pregnancy proceeds well. Late into the pregnancy, Fontaine is still investigating the Marcato case and warns Rosemary to keep her eyes open. Rosemary discovers a secret door in their closet, which leads to a study containing books on the occult. Rosemary takes one of the books, which is about witchcraft and contains a handwritten note "It's an anagram!" above a page on Steven Marcato. Rosemary shares her suspicions with Guy that Roman Castevet is Steven Marcato, and that the Castevets are witches with sinister designs on their baby, but Guy insists that she is being paranoid. While searching for their passports, Rosemary discovers Julie's crucifix necklace and suspects that Guy is part of the conspiracy. Rosemary sneaks out of the apartment to meet Fontaine, but he is run over by a truck while Rosemary watches. Rosemary goes to Dr. Bernard (
Oisín Stack), Julie's friend, but he thinks that she is delusional and calls Guy. Rosemary is taken back to her apartment, where she has a panic attack and is sedated just as she is going into labour. She wakes up three days later in a hospital and is told that the baby died and that its body was cremated. After being discharged, Rosemary leaves Guy and declares that she is going back to New York. While packing her things in the apartment, Rosemary hears a baby's cries and starts lactating. She goes through the secret door to the Castevets' apartment, where she finds Guy, the Castevets and their friends standing around a crib containing her baby. Rosemary is disturbed by the baby's demonic eyes, and is told that its father is Satan and the baby is their Prince. Roman encourages Rosemary to be the baby's mother, and she lifts her son out of the crib to nurse him. The film ends with Rosemary pushing her son in a pram, and when passersby admire him, she says, "He's perfect." ==Cast==