Ted Bundy. John Wayne Gacy. Jeffrey Dahmer. The names of notorious serial killers are usually well-known; they echo in the news and in public consciousness. But most people have never heard of Israel Keyes, one of the most ambitious and terrifying serial killers in modern history. The FBI considered his behavior unprecedented. Described by a prosecutor as "a force of pure evil," Keyes was a predator who struck all over the United States. He buried "kill kits"—cash, weapons, and body-disposal tools—in remote locations across the country. Over the course of fourteen years, Keyes would fly to a city, rent a car, and drive thousands of miles in order to use his kits. He would break into a stranger's house, abduct his victims in broad daylight, and kill and dispose of them in mere hours. And then he would return home to Alaska, resuming life as a quiet, reliable construction worker devoted to his only daughter.

When journalist Maureen Callahan first heard about Israel Keyes in 2012, she was captivated by how a killer of this magnitude could go undetected by law enforcement for over a decade. And so began a project that consumed her for the next several years—uncovering the true story behind how the FBI ultimately caught Israel Keyes, and trying to understand what it means for a killer like Keyes to exist. A killer who left a path of monstrous, randomly committed crimes in his wake—many of which remain unsolved to this day.

With the glut of true crime novels, documentaries, and podcasts competing for your attention these days, it’s easy to feel like serial killers are the most famous people in America. But you’ve likely never heard of Israel Keyes, arguably America’s least famous Most Wanted, who committed an astonishing series of murders between 1996 and 2012. One of the most dangerous killers in American history, Keyes was as meticulous as he was deadly, for years leaving a trail of cold cases across the country. The story of his crimes and eventual capture, as told by Maureen Callahan, is almost impossible to put down.

In American Predator, Callahan takes us through the twists and turns of the Keyes investigation, tracking the killer from Alaska to Texas, then through a series of interrogations that revealed the full horror of Keyes’s crimes. At the center of the story are the investigators who for months sought to capture, then understand, the man behind so many killings. Callahan excels at depicting the desperation and determination of the men and women who apprehended and interrogated Keyes, as well as the harshness and isolation of Anchorage, Alaska, the hometown of Keyes’s final victim.

Not to state the obvious, but this book is about cold-blooded murder; if gory details aren’t your thing, then you should probably pass on this one. But if you like true crime, then American Predator stands out from the rest: The narrative is focused, riveting, and scary. Callahan reminds us that serial murderers are extremely rare—but that won’t stop you from looking over your shoulder when you find yourself alone in the dark.