The attempted assassination of Queen of Albion leads to a probe into spies from different factions to test their allegiance. During the escalating tensions, Ange, Dorothy, Charlotte, and Chise Toudou receive an order to extract a captive antique bookstore owner. However, their task quickly turns into a daunting challenge when Control commands them to unmask a traitor in the royal family. As Team White Pigeon sets out to uncover a suspected double agent, Ange and her colleagues are plunged into a treacherous world of deceit and violence. Their mission intensifies as they must locate a fellow spy with only one clue - the alias Bishop.