The Last Wish By Andrzej Sapkowski

Geralt is a Witcher, a man whose magic powers, enhanced by long training and a mysterious elixir, have made him a brilliant fighter and a merciless assassin. Yet he is no ordinary murderer: his targets are the multifarious monsters and vile fiends that ravage the land and attack the innocent. 

But not everything monstrous-looking is evil and not everything fair is good. . .and in every fairy tale there is a grain of truth. 

The Last Wish story collection is the perfect introduction to a one of a kind fantasy world.