Bonfires of Novigrad
We go to Novigrad in search Triss. , we see thieves at the place indicated on the map thieves. After talking with them we learn that people left Novigrad or hide. And they recommend to go to the "rotten Grove" and talk to the King of Beggars. You need follow for the thief (which I happily lost in the crowd), or ask at the poor to find location of the rotten Grove. The beggar says the location from the second call. He also says the code word for the passage. We go there. You can call the code word or can just pay and go.
Finally we meet Triss and talk to the King of Beggars. Then follow Triss to her "client." However, before it you need to take from her acquaintance desired magic ingredients. Familiar replied that the ingredients were loss. The dialogue will have a choice - to say that you find, or that he do it. I choose first option. During the search will be found and other interesting items. We go down to the basement (do not forget to take it, "Liriyskie leather pants"), and then in the mode of intuition Witcher find button disguised as a brick, and click on it: