I need some advice on how to proceed...
My group managed to knock out Tyrion in the last fight of the previous book and take him as a prisoner with them when they stepped through the portal.
How can everyone dismiss the drow when the group actually brought a live one with them?
Help! lol
Ultradan
(my details on the AP are a little foggy now, so forgive any of my mis-remembering here ...)
You should still have them subdued, arrested, and put in the prison for "being drow sympathizers and orchestrating a plot to sneak a dark elf into Kyonin" or "traveling in the company of a dark elf". They can still notice the mild shock on their arrestor's faces, but they are arrested none-the-less to "let the proper authorities interrogate and confirm their story".
They are now in their prison just as in the AP, and you just have to work out the details of their interaction with the Queen in this case.
Given the revelation of a real dark elf, the queen may act faster to put the PCs into motion and head to the Winter Council stronghold, probably revealing the true nature of the succubus (?) prison and asking them to play along and work with her to locate the council. Now, they need to try to keep up the appearance that they are letting her blindly lead them along.