The shocking new psychological thriller from the bestselling author of A Man Downstairs and An Unthinkable Thing: a twisty, unsettling, and masterfully plotted game of magnetic push-and-pull between two women whose secrets threaten to collide.

When Mia was a young woman, she read a magazine article about a murderous teenage girl with a rare and disturbing psychiatric delusion. Fascinated by the details, she sought out the doctor who’d treated the girl, and eventually married him. Twenty years later, Mia’s curiosity is piqued once again when her husband announces that his famous case study will be republished—and that he will be reconnecting with his former patient.

Lainey has never felt that her feet are fully on the ground—not since she was released from a psychiatric institution at the age of twenty-one. When her former doctor reaches out, she decides to tell him the truth about what happened all those years ago. Perhaps she can finally lighten the darkness that has defined her entire existence.

With mirroring software, Mia pores over every recorded therapy session with Lainey, almost as though she’s watching a true crime drama unfold. On the opposite side, Lainey becomes intensely interested in her doctor’s family. How far will she go to insert herself into his seemingly perfect life?

Praise for The Case Study

"A dark exploration of trauma, obsession, and psychological damage juxtaposed against the enduring power of friendship. The Case Study is sexy, elegant, and twisty, with complex protagonists and monstrous villains."
--Robyn Harding, internationally bestselling author of Strangers in the Villa

"An edgy, propulsive thriller that will have you questioning the motives of every character as you race toward its immensely satisfying close. A fantastic read!"
--Tracy Sierra, author of Warning Signs and Nightwatching

"With its vivid protagonists, two women mired in secrets and buried pain, The Case Study is a spicy, devious, beautifully written thriller."
--Roz Nay, author of The Offing and Our Little Secret