Surely killing her would be the lesser evil? Renfri offers Geralt a counteroffer: kill Stregobor and she won't have to kill a whole bunch of people to get to him herself. Stregobor is convinced Renfri is a creature of dark magic who can cloud men's minds. The last man Stregobor sent to kill her had raped and robbed her before she killed him. Renfri in turn wants Geralt to kill Stregobor.
Stegobor is utterly convinced she is evil incarnate. Stregobor offers to pay Geralt to kill one of the last girls, a former princess named Renfri. He believes all the girls born under the curse will serve a demon named Lilit and destroy the world. Geralt meets a wizard named Stregobor who's obsessed with something called the Curse of the Black Sun. A tough but kind woman named Renfri defuses the situation and buys him a drink. Witchers are feared and shunned in this world. He encounters racist taunts from the locals at the pub. Then Geralt heads to the nearest town to collect his pay.
He wears the same leather armour featured in The Witcher 3: Wild Hunt game, so the show references the games after all. The show hits the ground running with hero Geralt fighting a giant spider creature in the woods.