Mireille and Kirika are contacted by a man within the Soldats who is willing to give them a book containing valuable information. As the two women follow up this intriguing lead, they once again come up against the ""true Noir"", the mysterious assassin Chloe.

It has been a decade since Mireile was forced to flee from Corsica after the murder of her family, and she has always been too afraid to return- until now. Determined to uncover the truth about her parents' murder and its connection to the Soldats, Mireille returns to her childhood home. But as she tries to stir up information from the past, she attracts the attention of those who would rather it remained buried…

Still upset over the truths she learned in Corsica, Mireille wants nothing more than to be alone, and sends Kirika away for a while. Wandering the streets on her own, Kirika is approached by a faction of the Soldats, promising to supply information. But if Kirika follows this lead, she will be leaving Mireille alone- and vulnerable…

Mireille and Kirika continue to chase leads that might help them locate a copy of the manuscript about the Soldats, unaware that the danger is greater than ever. For the Soldats council is fed up with playing Altena's games in which Kirika and Mireille are given ‘trials', and decide that now is the time to finish them off, once and for all…

For Kirika and Mireille, the point of no return has been reached. For, as Kirika's memories come flooding back, Chloe unravels the mysteries of the past for Mireille, revealing the true identity of her parents' murderer. When they first met, Mireille promised that she would kill Kirika once they discovered the truth, but now that the time has seemingly come, will she keep her word?