A synopsis has also been released for this season:
As monarchs, mages, and beasts of the Continent compete to capture her, Geralt takes Ciri of Cintra into hiding, determined to protect his newly-reunited family against those who threaten to destroy it. Entrusted with Ciri’s magical training, Yennefer leads them to the protected fortress of Aretuza, where she hopes to discover more about the girl’s untapped powers; instead, they discover they’ve landed in a battlefield of political corruption, dark magic, and treachery. They must fight back, put everything on the line – or risk losing each other forever.
— The Witcher (@witchernetflix) April 4, 2022