C90 Genius!

"Yes, I read through it all night," Zachary said, though he was unsure whether Bladwin had been stealthily watching him from outside the window. But he didn't consider such a minor detail significant.

Bladwin, still doubtful, asked with a furrowed brow, "Have you read this book before?"

If Zachary was familiar with the book, his quick memorization wouldn't be so astonishing