A year ago, Zoe Jacobs disappeared without a trace. Her sister Emily cannot come to terms with the loss and does not stop her own investigation. Emily's emotional state has been greatly shaken and causes concern among friends and colleagues. One day, after a minor operation, she wakes up in the clinic and sees a doctor unsuccessfully trying to resuscitate the woman in the next bed. But in the morning, absolutely everyone says that the bed was empty, and what she saw was just a nightmare due to anesthesia. Emily believes the doctors - until she discovers physical evidence of the stranger's existence. The woman disappeared and her fate is unknown. What is the staff of an expensive private clinic hiding, and can Emily trust herself?