Matt Harpold has written at least 1 book. Their most popular book is Unseen Masters: Modern Struggles Against Hidden Powers with 1 save with an average rating of -⭐.
Series
1 primary book2 released booksAuthored 3% of series
Call of Cthulhu RPG is a 33-book series with 1 primary work first released in 1981 with contributions by Sam Johnson, Dave Blewer, and 54 others.