There are individuals who are invisible to the world. They live unnoticed, unnoticed by everyone, fading away as soon as you turn your gaze.

This is what makes them ideal assassins.

The Institute finds such people when they're young, taking them away for training. But an untrained Nobody is a danger to their operations. And dangers must be eliminated.

Sixteen-year-old Claire has always been invisible, slipping under the Institute’s radar. But now, they've discovered her and send seventeen-year-old Nix to take her out. However, the moment he sees her, he cannot pull the trigger. It’s as if only they exist in the world, as if they are the only ones who matter to each other. And they are—because no one else ever notices them.