An Amnesia: The Dark Descent fan comic. It tells the story of Daniel prior to the start of the game.
Roughly 300 pages, black and white.
August, 1839: an Amnesia the Dark Descent fan-comic
If you're not happy with the book you can return it, but you'll have to pay your own shipping, and I'll refund you the cost of the book. I'd say you've got about 60 days after you receive the book, just shoot me an email (firstname.lastname@example.org) so I know to expect it.