After a personal tragedy, Guy and Rosemary look to get a fresh start by moving to Paris. When the married young couple land an apartment with a haunted past, the upscale address and the comfort they find in new neighbors Roman and Margaux Castevet blurs the history. Settled in and with Guy's career taking off, the couple conceive, but Rosemary's health begins to decline and, over time, the terrible truth about the baby -- and the people they welcomed into their life -- comes to light.