How about that text from the qr-code which got us to Again.7z?
"Never underestimate the determination of a kid who is time-rich and cash-poor."
http://qr.w69b.com/g/t2lFujr0I
I've tried doing sha(sha()) on said text, the title of the book and the name of the author using a different casese, spaces, with and without hyphen-minus...
No luck so far.