I love creepy stories in old houses. I like when I get to the end of the story and find a plot point that shocks me as this one did. 

Rowan becomes a nanny to three little girls, the Elincourt sisters. The mom and dad leave her the first day to take care of business matters. The big house, very modernized with a system run from an app, has secrets hidden. But Rowan also has secrets. 

I love that a big part of this story is told in letters from Rowan in prison. The discovery of why is told in what happens in the house and with the girls from Rowan's perspective. 

I thought this was a solid mystery.