Entrances to the dungeons of Oxenfurt. (The Witcher 3: Wild Hunt)

Maybe someone remembers, skrinit.
In one of the quests about Ml. Bastard, the book should have been put in a hiding place. For this quest, a couple of triples of points shone, so I went to Roche, leaving the underground ... I can’t find the entrance, the current is displayed on the surface, the crust is stuck. help