Final Del Juego by Julio Cortazar

Written with the enthusiasm of the very genius, the eighteen short stories that compose Final del juego constitute so many experiments of perfection. All the stories are gripping to the end, but "No se culpe a nadie," "El ro," "Axolotl," and "La noche boca arriba" deserve special mention. It also includes the story Los venenos which he considered autobiographical. 

This volume constitutes an excellent way to approach one of the best writers of the 20th century.