Warcross

Penguin presents the audiobook edition of Warcross by Marie Lu, read by Nancy Wu.
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.
Fast paced, addictive . . . just about perfect - The Book Smugglers