Call of Cthulhu RPG, 7th Edition is a 6-book series with 6 released primary works first released in 2013 with contributions by Sandy Petersen, Paul Fricker, Mike Mason, Lynn Willis, Chris Spivey, Mark Morrison, Dean Engelhardt, Marion Anderson, Phil Anderson, Geoff Gillan, Richard Watts, Darren Watson, Vian Lawson, John Hughes, Tristan Goss, James Haughton, Brian M. Sammons, Lynne Hardy, and Chad Bowser.