I read Lu's trilogy "Legends" and liked it. This book is better. Warcross is a well thought out adventure story about a girl on the outs of society, trying to get by as a bounty hunter. She is a hacker, and gets a job hunting within the Warcross game, working for the super rich most famous guy who invented the game. Everyone on earth plays this game Warcross, they even have a world championship.
Emika, the star, is a well developed character. Lu does a great job with the technology and even romance!
Warcross is my new favourite mainly because of the action, oh, and also a good twist at the end, so there is sure to be a sequel.