It's good! I liked it! The ending wasn't as good as the buildup, but is it ever? I'm not really a thriller gal but this was good enough for even me to enjoy a lot. I grew attached to the characters--the dynamic between the nanny and the protagonist was really fun. The tension, the different threads that seemed to go nowhere until the end, all of it kept me on edge. And hey, Asian female lead. Can't go wrong with that.