It was supposed to be their night out - a night for Libby and Sean to relax, laugh, and hit the reset button on their marriage.  When they return home, however, their babysitter Sasha has disappeared, and their 4-year-old daughter Alice has been left home alone.  What happened?  Where is Sasha? Did she run off, or was foul play involved?  And does this have anything to do with the mysterious note Libby found?   This book grabbed my attention from the prologue didn't let it go. I loved the slow-building confusion, how things kept growing murkier until I felt as if I were trudging blindly through a fog, trying to make sense of things, not sure who I could trust.  Without saying too much, I would have liked to see a little more closure at the end - to see how characters' lives are playing out a few months down the road.  All in all, though, this was an addictively fun read, and I will be looking out for more books by Samantha Hayes in the future.