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The Witcher game as we know it would never have been the intense and intriguing story it is without its source material. The entire inspiration for the world comes from Sapkowski’s books, while much of the third game builds directly on the series itself.
The Witcher books help you understand Geralt’s anxiety against those in power, explains his relationship with Yen, and reveal how he came to know Ciri. It’s an incredibly important series, and once you read it, you’ll start seeing references all the time throughout the game.