"An absolutely gripping read... both satisfying and chilling." -Ellery Lloyd, author of the New York Times bestseller The Club

Meet Eva, who can't feel pain, and Anna, who can't escape it.

Everyone has heard about the case of Eva Reid. Ever since she was born, she's felt no pain: she can get a paper cut, break a limb and even give birth without feeling a single thing. Her story has long captivated the minds of reporters and researchers--including Dr. Nate Reid, Eva's husband and acclaimed scientist, renowned for his work in the Pain Laboratory. Also among them is Anna Tate, a ruthless journalist with a dark past of her own.

When Eva is suddenly found dead inside her home, it raises a flurry of questions about the last night of her life--and who might've been involved. Anna finds herself growing increasingly obsessed with Eva's case: her protected, painless existence, her promising career as a psychotherapist, and especially her toxic relationship with the alluring Dr. Reid, whom Eva met and married as his former patient. But what other secrets could they be hiding?

When Dr. Reid embarks on the process of writing a book about Eva, an opportunity arises for Anna to work on it alongside him. As she slowly inserts herself into their home to uncover what's fact and what's fiction, shocking discoveries await her--and not everyone may come out unscathed...