Alone Against the Flames: A Solo Adventure for Call of Cthulhu 7th Edition Rules | 
I started reading this as part of the Call Of Cthulhu Starter Set. It is one of three books or manuals so to speak. It has a different cover and two other authors before this Gavin Inglis fellow.
FanOfTheStand This is so cool and can be played over and over again as it‘s a pick your own adventure along with dice rolls. So cool. 4y