From the introduction to the adventure:
Here you’ll find a complete introductory adventure to get you up and running in the Brimstone and the Borderhound universe. Rules references are included where necessary throughout the adventure, so when the time comes, all you have to do is follow the instructions, roll dice, and go! Relevant statistics and a collection of six sample characters are included at the end of the module so you can even continue your adventures after this game, if you like! Again, if you’re picking this up before the book comes out, you can easily integrate characters from Amazing Adventures into this game to expand your options further.
User summary:
This "Open & Play" product includes the introductory adventure A Cold Day In Hell as well as a setting introduction and all the rules necessary to play the scenario.