Be careful who you let in.

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.

Twenty-five years ago, police were called to 16 Cheyne Walk with reports of a baby crying. When they arrived, they found a healthy ten-month-old happily cooing in her crib in the bedroom. Downstairs in the kitchen lay three dead bodies, all dressed in black, next to a hastily scrawled note. And the four other children reported to live at Cheyne Walk were gone.

I have a confession to make: I am a sucker for a good domestic suspense novel. Nothing makes me happier than a dark and soapy multigenerational mystery, and nobody excels at the genre like Lisa Jewell. Her characters are reliably unreliable, her mysteries are unnervingly twisty, and she manages to do all that without sacrificing well-developed relationships and emotionally layered characters. Which is quite a feat, especially in her latest book, which also happens to feature poisonous gardens, creepy cults, acid trips, and mass murder!

Libby Jones was adopted as a baby and grew up wondering who her birth parents were. Now an adult, she is stunned to receive a letter not only informing her who her mom and dad were, but also notifying her that she is the sole beneficiary of their abandoned London mansion. Said mansion just happens to be the location where her parents were found dead 25 years ago (of course!!). As Libby begins to unravel the secrets around her parents’ deaths, she soon suspects she might not be the only relative looking for answers.

Told from three alternating points of view, The Family Upstairs is a fast-paced whodunit that will keep you guessing until the final delicious sentence. If I had any issues with the book, it would be that my productive Sunday afternoon came to a screeching standstill when I naively thought it would be a good idea to start this unputdownable read. Don’t say I didn’t warn you.