There's a reason Lisa Jewell is probably my favorite contemporary suspense writer, and she has me singing her praise yet again after this upcoming book, due to be released on November 6th. Thank you, Netgalley, for this ARC in exchange for an honest review. 
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The letter comes soon after her 25th birthday - the letter Libby has been expecting. Finally, the mystery of who she is will be revealed, but what Libby did not expect was to inherit the mansion in which she was born. Twenty-five years ago, she was found in her crib upstairs while downstairs, three adults were found dead, along with the quickly written note that was beside them.  The other children who had been living in the house had mysteriously disappeared. As Libby delves into the history of her inheritance, she will come face to face with her family's disturbing past.

This book had me riveted from the moment I began reading it. For me, it had a slow burn feel to it, gathering speed in both suspense and creepiness.  One thing I love about Lisa Jewell's books is that characters who at first appear to be normal, everyday people slowly morph into something altogether sinister.  I also like the different viewpoints and the time shifts - I felt it worked well with the story.  If you're looking for a creepy book that will get under your skin and have you thinking about it even when you're not reading, definitely pick this one up.  I have a feeling The Family Upstairs will stay with me for a while. ⭐⭐⭐⭐