Bloody Baron
Main quest
Velen suggested level 6 
On the world map
From the journal
The guards at the castle gate were clearly not happy to see Geralt. They denied him entry, growling a few threats as they sent him on his way. However, the witcher had to talk to the Bloody Baron, so he set out to find another way into Crow's Perch.
Surprisingly, Geralt got some help from a villager he met near the castle. The old man directed the witcher to the source of an old well, claiming Geralt would find a way into Crow's Perch from there.
Geralt found his meeting with the Bloody Baron quite peculiar, and the baron himself not so bloody at all. Or did it just seem so? In any case, it turned out Ciri had indeed visited Crow's Perch some time past, but further information about her was only available for a price.
Nilfgaard's agent had determined Ciri had stayed with the baron - the self-proclaimed ruler of Velen. This man was known for his violent temper and three-mile-long cruel streak, hence his moniker: the Bloody Baron. Geralt, however, was not one to be frightened by nicknames, least of all those taken from bodily fluids, and so made his way to Crow's Perch, the baron's seat, to ask about Cirilla.