Sleep Well, Mommy: A Novel Ecco

Criminal psychologist Seonkyeong gets an extraordinary opportunity when notorious serial killer Yi Byeongdo—previously unwilling to speak—asks specifically to be interviewed by her. At almost exactly the same time, her husband's quiet 11-year-old daughter Hayeong comes to live with them after her grandparents die in a house fire. As Seonkyeong gets to know both of them, she begins noticing disturbing similarities between the convicted killer and the child living under her roof.