The reason was simple.
The Dead Spirit Book consumed the Contractor's power when used, and the Bloodline's power came from their bloodline, which meant the girl was likely sustaining the Dead Spirit Book's operation with her Bloodline Power, with her vital force.
This cowardly Holy Artifact didn't dare to trouble Charlotte. If Charlotte used the book, it would surely continue to drain the Bloodline girl's power...
In other words, Charlotte had no intention of cutting off the contract with the Dead Spirit Book. Instead, she planned to bleed the Bloodline girl dry using the Dead Spirit Book... With this fatal leverage, the other party would definitely try every means to retrieve the Dead Spirit Book.
At this thought, Charlotte suddenly felt a surge of inspiration and looked down at the Dead Spirit Book in her hand.
Right now, the Dead Spirit Book was faintly flickering, emitting a soft glow.
Sensing some mysterious rhythm, Charlotte said with a half-smile,
