First the book was published anonymous, later Paul attributed himself to it (and you can rather easily verify by checking his other writings published at the time and after). 
I found the book years ago, and did the audiobook recently.  

 You can pick up a physical copy here:

https://thebitcoinshop.uk/product/a-lodging-of-wayfaring-men/

Pay in Bitcoin too! 

 Thanks for the update.