Raisa Susanto

The double murder of a married couple in a small Washington town draws FBI forensic linguist Raisa Susanto into an investigation that mirrors a decades-old crime. Twenty-five years ago—to the day—Alex Parker murdered his parents, then took his own life, leaving behind a note admitting everything. Raisa, paired with forensic psychologist Callum Kilkenny, uses her skills to read between the lines. Especially now that paranoid postings on a conspiracy thread suggest that Alex was a victim himself.

Forensic psychologist Callum Kilkenny lost his wife, Shay, to the very serial killer he’d hunted for five years. When Nathaniel Conrad—known as the Alphabet Man, for his love of tattooing codes onto his victims’ bodies—was condemned to death row, Callum thought the game of cat and mouse was over. But just before execution, Nathaniel drops a bombshell: he’s not the one who murdered Shay.

FBI forensic linguist Raisa Susanto thinks she’s through with the past now that her psychopathic serial killer sister, Isabel, is locked away forever. Then Raisa receives a letter from Isabel. It’s just a single message: By the time you read this, I’ll be dead. Soon after, Isabel is discovered dead in her cell, forcing Raisa back into her depraved orbit—one that includes a band of true-crime worshippers obsessed with Isabel, her killing spree, and those who survived it.