As the Tokken unit presses forward with its inquiry into the city's unsettling murder pattern, Imari and her colleagues follow fresh leads that tie the crimes to the cryptic phrase "Spear of Longinus." Their trail leads to a clandestine group whose rituals appear intertwined with the victims, prompting tense surveillance and careful evidence gathering. Imari's earlier encounters lend urgency to the probe as the team edges nearer to exposing the sect's hidden motives and methods.