Blood of Elves (The Witcher, #1) by Andrzej Sapkowski

The New York Times bestselling series that inspired the international hit video game: The Witcher.
For over a century, humans, dwarves, gnomes, and elves have lived together in relative peace. But times have changed, the uneasy peace is over, and now the races are fighting once again. The only good elf, it seems, is a dead elf.

Geralt of Rivia, the cunning assassin known as The Witcher, has been waiting for the birth of a prophesied child. This child has the power to change the world – for good, or for evil.