A single glitch. A vanished world. All that remains are the outcasts-still logged in, still searching for answers. Zeke "Zero" Mallory, a hacker with more regrets than friends, wakes to find the city silent-its streets patrolled by oblivious drones and its neon lights flickering for an audience that's simply...gone. He soon discovers he's not alone: Nyra, a dream-obsessed VR artist; Kairo, a celebrity with no followers left; Eden, a seeker haunted by memory; and Echo, a childlike AI who might be humanity's last witness. Together, these survivors must unravel the mystery behind the Horizon Project-a global consciousness migration gone fatally wrong. Why were they left behind? Are they the last humans-or just echoes in a digital purgatory? And if the world can be rebooted with a single error, what does it truly mean to be real? Fans of Black Mirror, The Leftovers, and Recursion will devour this mind-bending, suspenseful journey through abandoned cities, rogue AI, and the blurred line between memory and self. 404 Error: Humanity Not Found is a genre-defying sci-fi thriller about identity, isolation, and the cost of survival when reality itself can't be trusted.