Ruth Ware always delivers when it comes to interesting and layered characters. The Turn of the Key is a thrilling account of Rowan Caine's experience as a live-in nanny in a luxurious smart home unlike anything she has ever seen. This mystery is the epitome of the saying "if it's too good to be true, it probably is" because even though moving into the home of the Elincourts is an upgrade from her tiny apartment and dead-end job, it comes at a steep price. Every chapter, there is something suspicious that kept me wondering if anyone in this suspenseful book was telling the truth. Which, is obvious in the first page because Rowan is writing a letter to a lawyer, from jail, because she's being held for murder. Who is Rowan? Did she come into the Elincourt's lives for a reason? She should have known something was wrong on the day she interviewed, when one of the children warned her to never come back. With a house full of surveillance cameras and parents who ar...