『The Turn of the Key』要約

Ruth Ware’s 2019 novel *The Turn of the Key* is a contemporary gothic thriller narrated by Rowan Caine, a young British nanny awaiting trial for the murder of a child in her care. The story unfolds through a long letter Rowan writes from prison to a solicitor, pleading her innocence and recounting how she came to work at Heatherbrae House, a luxurious “smart home” in the Scottish Highlands. The building’s remote location, glass walls, and app-controlled systems—cameras, lights, locks, and a music system that sometimes plays on its own—create an atmosphere of constant surveillance and unease. Rowan is hired by the wealthy Elincourt family to care for their four daughters after their previous nanny abruptly left. The parents, Sandra and Bill, are often absent, and the children range from a hostile teenager to a troubled youngest child who insists she communicates with the ghost of a former nanny. Ware structures the novel around Rowan’s retrospective account, with each section framed as a piece of her letter, interleaved with the legal jeopardy she faces. The narrative deliberately echoes Henry James’s *The Turn of the Screw*, using an unreliable first-person voice and a governess figure isolated with children who may or may not be haunted. The smart-home technology becomes a distinctive framework for suspense, blurring the line between supernatural presence and surveillance or prank. The book explores class, motherhood, and the pressure on young women to be perfect caregivers, while withholding the full truth of what happened at Heatherbrae until the final pages.