In 'The Turn of the Key,' Rebecca accepts a lucrative position as a live-in nanny at a state-of-the-art smart home in the Scottish Highlands. Ideal from the outset, the job soon spirals into a nightmare culminating in a child's death and Rebecca's imprisonment for murder. Through letters to her lawyer, Rebecca recounts the string of chilling events and odd behaviors of the children that lead to her arrest. As the layers of complexity and deception are peeled away, Rebecca stands adamant about her innocence in the child's murder, pointing to another mysterious presence in the house as the real culprit.