We begin the second Witcher 2 Assassins of Kings Enhanced Edition act with Iorveth on our side, based on the decision we have made at the end of the first chapter in the game.
After we killed Loredo, or saved the elven women, Iorveths ship left Flotsam.
Triss Merigold is missing and the ship takes us to Aedirn, a region controlled in the past by the murdered King Demavend.
Now, Aedirn, as well as the City of Vergen, are claimed by Stennis (the son of Demavend) and Henselt, the King of Kaedwen, who wishes to gain control over the Upper Aedirn.
When the second chapter of the game begins, you will play as Stennis.
After a short discussion with Saskia and the Priest of Kreve, you will march towards a meeting place, where Henselt waits for you.
The first main-quest of the second act (Prelude to War: Aedirn) begins now.