More like a set of well organized campaign notes than a typical "module" or classical dungeon. Civil War premium edition contains everything you need to run the Civil War story line through your groups own personal "what if" scenario. Very little of it is hard wired, most events don't hinge on particular Heroes belonging to one side or the other. It is more of a story arc outline but with suggestions for heroes for each side.
The only thing I would suggest is that you read through the entire plot for all acts before begining play to make sure you help guide the story in the best possible way, and allow you to foreshadow future events if possible (you never really know what your players will do)
[5 of 5 Stars!]