This is a Pathfinder adventure written by Suzi Yee and is called "One on One Adventures #12 Journey into Riddle Canyon." It is a 1:1 adventure for 1 GM and 1 Fighter level 6-8 or a 4 person party of levels 2-4.
We are now playing this as a six adventurer seperate thread solo adventure running concurrently. Which PC will finish the adventure, solve the mystery, and gather the most loot first? Which would be hero will be crushed in a blaze of glory or humiliation? Only time will time as they "Journey into Riddle Canyon!"