Criminal psychologist Seonkyeong receives an unexpected call one day. Yi Byeongdo, a serial killer, wants to be interviewed and asks specifically for her. That same day Hayeong, her husband's daughter from a previous marriage, shows up at their door after her grandparents die in a sudden fire. At work and at home, Seonkyeong starts to unravel the pasts of the two new arrivals in her life and begins to see startling similarities. An eerie and absorbing novel.