Marie Lu 
Warcross [EPUB ebook] 

For the millions who log in every day, Warcross isn’t just a game – it’s a way of life. Struggling to make ends meet, teenage hacker Emika Chen works as a bounty hunter, tracking down players who bet on the game illegally.When Emika hacks into Warcross, she is shocked when she gets a call from the game’s creator with an irresistible offer. He needs a spy on the inside of this year’s tournament in order to uncover a security problem . . . and he wants Emika for the job. In this sci-fi thriller, #1 New York Times bestselling author Marie Lu conjures an immersive, exhilarating world where choosing who to trust may be the biggest gamble of all.