Intro
This was never a book of MGA.  This is simply a collection of some of MGA’s letters and announcements that he paid to get published in 1893.  However, its unknown where these announcements were published, in terms of what newpaper.

Links and Related Essays
https://www.alislam.org/library/books/Conclusive-Argument-Islam.pdf

https://ahmadiyyafactcheckblog.com/2019/01/13/what-is-raz-e-haqiqat-in-english-as-a-hidden-truth/

https://ahmadiyyafactcheckblog.com/2019/01/13/what-is-arbain-a-book-by-mga-and-his-team-of-writers/