N

My vision and my heart were completely taken over by "N."

The case of five missing middle school boys, the massacre of an entire elementary school class.
A car crash resulting in the deaths of two people. The letter "N" was left at each of these crime scenes.

An urban legend circulates, suggesting the main culprit is 'N,' a religious group thought to have collapsed 2,000 years ago.

What exactly is "N"?