If you sided with Iorveth, you'll encounter some soldiers who are pulling a cart with either Triss or Iorveth on it. Attacking the cart rescues that person, and your companion will take the other to a safe place, but will be back in time to accompany you into the end credits.
If you sided with Roche, some soldiers will attack you. If you chose to go after Triss earlier, Roche will be lying on the side, and Triss will take him somewhere safe, but be back in time to accompany you into the end credits.
Continue along the streets to meet some burning bodies. Enter the middle door and talk to Letho. Ask him everything you can, then choose whether or not to kill him. If you let him live, you'll meet him again in The Witcher 3.
Congratulations on beating The Witcher 2! Stay through the credits to see a cinematic. Or just press ESC.
last modified 25 June 2020