Apprentice Liar and the Death of the World (en Inglés) - Isabel J. Kim

Arrow-Lee sold his first name to Death in a dream. In return, he relives his family’s death in his nightmares until he can figure out how to rewrite time, cheat Death, and live happily ever after. Should be easy. There’s only one problem: Arrow-Lee is seventeen and doesn’t know how to do any of that. Fortunately, he's found Calla, a wizard with a library filled with black magics, and Arrow-Lee has no problems lying and grifting his way into an apprenticeship with her.
 
But apprenticeship comes with its own challenges. Like getting attached to Calla, who he’s supposed to be stealing from. Like learning that there are worse entities to make deals with than Death. And like learning that their timeline is more fragile than Arrow-Lee realized, and he might be the only person who can prevent reality from cracking like an egg. It’s too bad that everyone Arrow-Lee ever loved is on the other side. With reality itself on the line, Arrow-Lee is going to have to decide what really matters to him. 

Award-winning author Isabel J. Kim's Apprentice Liar and the Death of the World is a smart contemporary fantasy filled with humor, heart, and the mind-bending physics of magic that's perfect for fans of Lev Grossman and Maggie Stiefvater.