I can give you screenshots of particular letters if that could help you.

http://i35.servimg.com/u/f35/15/37/26/36/garamo12.png

IM Fell Types  Sugerido por fonatica 

Wow, it seems that you are right! I can't believe that a $40 book used a free font. I can't believe either that you fond it so quick! Thank you!

It seems, according to this screenshot (the Swash capitals) that they used "Im Fell Dw", but doesn't it seem a little bit too bold compared to the font used in the book, or does it seem okay to you?

http://i35.servimg.com/u/f35/15/37/26/36/garamo12.jpg

On the left, Im Fell Dw, on the right, the book: http://i35.servimg.com/u/f35/15/37/26/36/garamo13.jpg Here it seems to match.
But here, there is a ligature "fi": http://i35.servimg.com/u/f35/15/37/26/36/garamo15.jpg I guess that even though it is a ttf font, they found a way to add ligatures.

http://www.dafont.com/im-fell-types.font?text=%A5

Yeah I've seen on the creator's website that there are OTF versions of the fonts Thanks for the reply!