In a future divided by the Fragmentation Wall, humanity is split into two castes: the Thinkers, who rule from a fortified technological city, and the Enactors, who labor beyond it. Between them stands M.A.S., an autonomous security system built to preserve order at any cost.When an archivist uncovers an unmarked cortex disk labeled M-0, he finds the fractured consciousness of a man named Meliade.As a teenager, Meliade took the allocation exam that determines who may rise into the elite and who will be cast out. When he appears to fail, his world collapses, only for him to discover that the test concealed something far more disturbing: a hidden mechanism designed to identify exceptional minds.Years later, now a high-ranking Thinker, Meliade has gained everything the system promised and lost the ability to feel joy. His intellect has become a shield, suppressing emotion and distancing him from the human cost of the world he helps sustain.When an experimental neurological treatment called Gaudium offers to restore what he has lost, Meliade is forced into a confrontation with memory, identity, and the hidden logic of the society that shaped him.M-0 is a philosophical science fiction novel about control, consciousness, and the search for happiness in a world built to erase it.