Leanne wakes in a dim room with no memories. The only clue: the word Theresia written on a scrap of paper. The building around her is a maze of locked doors, hidden traps, and underground levels stretching far deeper than she could have guessed. As she ascends through the subterranean prison — past waterworks, storage rooms, and torture chambers — fragments of a larger truth emerge: a war, a military testing laboratory, a woman named Maylee, and a silver-haired figure soaked in blood.