It was announced by Netflix that Andrzej Sapkowski’s The Witcher series is being adapted into a television series that will stream on their service. Netflix acquired the license for The Witcher back in May, but it is important to point out that the adaptation will be of the book series, not the video game series that was produced by CD Projekt Red. Despite it being an adaptation of the books, there will be some overlap between the two in the adaptation.
There is, currently, no time frame as to when the series will debut on Netflix.
The first book, The Sword of Destiny, was published in 1992 and has since had seven sequels: The Last Wish (1993), Blood of Elves (1994), Time of Contempt (1995), Baptism of Fire (1996), The Tower of Swallows (1997), The Lady of the Lake (1999) and Season of Storms (2013).
Wikipedia describes the background of The Witcher as follows:
The stories are set on the Continent, which was settled several thousand years earlier by elves from overseas. When they arrived, the elves encountered gnomes and dwarves. After a period of war between the elves and dwarves, the dwarves retreated into the mountains and the elves settled in the plains and forests. Human colonists arrived about five hundred years before the events in the stories, igniting a series of wars. The humans were victorious, and became dominant; the non-human races, now considered second-class citizens, often live in small ghettos within human settlements. Those not confined to the ghettos live in wilderness regions not yet claimed by humans. Other races on the Continent are halflings and dryads; werewolves and vampires appeared after a magical event, known as the Conjunction of the Spheres.
During the centuries preceding the stories, most of the Continent’s southern regions have been taken over by the Nilfgaard Empire; the north belongs to the fragmented Northern Kingdoms. The Witcher saga takes place in the aftermath of the first major war between the Nilfgaard Empire and the Northern Kingdoms, with a second war beginning in the middle of the series.