I'm talking about this one:
http://www.amazon.com/The-Complete-S.../dp/B00AHE20W0
It's supposed to be the best one as far as having it work well on an e-reader, and this site says it's free:
http://www.theverge.com/2012/12/13/3...herlock-holmes
And it's actually showing as free on my completely separate US-account (which has a US address, I used it to buy two games on amazon.com). I'll try adding a US address to my account though and see if that works. Just gonna use one of a friend of mine
edit: Doesn't appear to have changed anything.. it's my primary address right now and I added my creditcard. The funny thing is that it doesn't even shop up via the search, neither on my kindle nor on my desktop PC. I've got to use the direct link.