"Originally published in Great Britain in 2019 by Penguin Random House UK"--Title page verso.

"Soon after her twenty-fifth birthday, Libby Jones returns home from work to find the letter she's been waiting for her entire life. She rips it open with one driving thought: I am finally going to know who I am. She soon learns not only the identity of her birth parents, but also that she is the sole inheritor of their abandoned mansion on the banks of the Thames in London's fashionable Chelsea neighborhood, worth millions. Everything in Libby's life is about to change. But what she can't possibly know is that others have been waiting for this day as well--and she is on a collision course to meet them. In The Family Upstairs, the master of "bone-chilling suspense" (People) brings us the can't-look-away story of three entangled families living in a house with the darkest of secrets"--Page 4 of cover.