It was ten minutes to seven o'clock, and so many people were pouring through the shadow library door. I could hardly believe it.

Cass had explained to me about why I could suddenly see the shadow library door from inside the regular library. She said all I had to do was think about it. But how could I think about it if I didn't know it was there?

"Exactly," Cass had answered.

Yeah, I still didn't quite get it. Because we'd made people aware of the shadow library on ...