"Let's be honest: Who hasn't fantasized about shooting someone in the face with a hunting rifle?"

One day, a thirteen-year-old girl decides to startle a classmate. Instead, she accidentally kills him.

And she likes it.

Over the years, she begins experimenting with murder. Her victims are, of course, people that deserve it: a careless driver, a CEO of an energy corporation that is destroying the planet, a rapist. Every crime scene is flawless -- untraceable and made to look like an accident or suicide. But, as she sleepwalks through her day job and lives in a crummy apartment, one thing becomes increasingly clear: she needs more.

Because nothing compares to the thrill of violent retribution.