Keeping one eye on the gleaming knife, she glanced around the bathroom, looking for a second exit. Besides the locked door, there was one small window placed high in the wall. It would be almost impossible to climb out the window, so she had to find a way out the door.

"Looking for an exit?" Ivy asked.

"That's cute," Lily sneered. "You're not leaving until we say you can."

The girls sprang on her. Lily grabbed her arms, and Ivy held her hair, pulling her head back. Catherine took a deep breath and slammed her head backward, crashing into Ivy's face with full force. A sickening crunch sounded behind her,...