What it says in the title. Greagoir (with Cullen's full support, most likely) refuses to let the Warden go, Silences them & their mage companions, knocks out the non-mage(s) and throws them all into the dungeon. The non-mages are eventually allowed to go, but Greagoir decides that the mages have to stay, since mages' place is in the circle, and he's not above keeping them in solitary until they see reason.
And since the blight won't wait, Warden has to escape the dungeon, evade the templars, escape a tower in the middle of a huge lake and not die in the process.

+ if Greagoir is not possessed/controlled, just a dick (I really don't like him)
++ if Warden & their companions receive the royal treatment while in the dungeon, i.e. all the worst things you can think of
+++++ if Anders is involved somehow (stuck in the dungeon at the same time maybe)
+++++++++++++++++ if Anders IS the Warden somehow (because this would add so much delicious angst... can you imagine how crushed Anders would be if he thought he was free of the circle forever, only to be trapped again after graciously saving the templars' collective asses)

http://dragonage-kink.livejournal.com/11571.html?thread=61466163#t61466163