[Dungoneer] Combining Heroic to Epic Sets

Question. I've read the rules and it says that everyone plays the Heroic Set until everyone reaches Level 4. Then What? Does everyone magically appear at the Entrance to the Epic Set? Or do you have to travel back to the entrance of the Heroic Set to get to the Epic Entrance?

Pull out the next set and continue as normal from where you are. Place new maps as normal, deal out Quests as normal, etc.