Fleance and her comrade, Banquo, were employed to steal the Scrolls of Merlin from archaeologists Arthur Morwood-Smyth and Lydia Duane. Hudson, however, managed to retrieve the Scroll that Banquo stole. Later, Fleance helped Macbeth in his efforts to claim Excalibur from King Arthur, supporting Banquo's point that Macbeth himself was a British king. She and Banquo attended Macbeth's wedding to Dominique Destine.
Fleance and Banquo left Macbeth's employ to join the Quarrymen. Fleance was at the recruiting meeting attended by Vinnie Grigori.
Fleance is named after a character from Shakespeare's play, Macbeth. In the play, Fleance is the son of Banquo. When Macbeth receives a prophecy that Banquo's descendants will rule Scotland, he sends murderers to attack Banquo and Fleance. Banquo is killed, but Fleance manages to flee.