I'd like to get into Call of Cthulhu. Which books do I need? I have a limited budget, so I'd prefer to get as few as possible. Specifically, tell me: How useful will the core book be on its own? ...
What changes are there between each edition so that I can update earlier edition modules more easily? I have many modules for Call of Cthulhu that I have picked up over the years but I only own 3rd ...