Quick recap
Washington, D.C., 2025. Police find a notebook Gary Soneji kept, titled "Profiles in Homicidal Genius." It traces how Soneji went from substitute teacher to serial killer and hints that Cross made mistakes in his early days as a homicide detective. Cross has to revisit that old case, his first run-in with Soneji, and face a threat tied to his own past. The ending wasn't checked against a reliable source, so it stays out.

