Dame Caterline belongs to the bourgeoise and is the daughter of the wealthy Purrtoir Demiau. She serves as the defendant for chapter 1 and is murdered in chapter 4a. She also appears in certain visions of Falcon as a reminder of his failure.
Caterline at first seems innocent, being somewhat scared in jail and hoping that Falcon will be able to prove her innocence. However, she is later revealed to be extremely manipulative, tricking Falcon into believing that she is innocent when she was in reality the murderer of Grenwee. She seems to be obedient to her father and respects him, as she likely killed Grenwee on his orders.