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In the subterranean labyrinth of the Holy Federation of Ossia, peace is a lie built on a foundation of disposable lives. Boris Khmelmach awakens in a damp cell with no memory of his crime. He is conscripted into the "Low Intervention" protocol, a state-sanctioned suicide mission where the unwanted—prisoners, dissidents, broken soldiers—are sent into the shifting depths of a mysterious underground complex to die for scraps of information. Their designation: Subhumans. It is the story of a man fighting to retain his soul in a place where humanity is the first thing sacrificed, and where the only way out may be to become the very monster he fears.