Killer Looks, by Steven Fisher

A brilliant killer. A broken investigator. A deadly game. The man who calls himself the Note Writer kills with precision—and leaves behind typed messages that turn each crime into a challenge. When one of those messages is addressed to Kevin Mathers, the meaning is clear: this time, the killer isn’t hiding. He’s playing. Kevin knows what it takes to catch killers like the Note Writer, and what it costs. Still struggling to recover from the cases that nearly broke him, he’s pulled back into the Homicide Department to lead a task force racing to decode a pattern that refuses to settle into anything predictable. But as the killings continue and the clues grow more pointed, the case begins to close in on Kevin. The choices behind each move feel deliberate and personal, and Kevin starts to realize he may not have been chosen at random.