Soul Slam, by Allie Burton

Olivia is sixteen, and has been raised by a theif. Her first assignment is to steal an ancient amulet that belonged to King Tut, but when her carefully planned mission takes a turn for the worst, Olivia doesn't know what to do. She is faced with many decisions that she wasn't prepared to make, and one of them includes a boy named Xander. If Olivia doesn't team up with Xander, her life will be at risk, but if she does, Olivia will be going against everything she has been taught. Not only is Olivia forced to live on the run, but she must solve multiple riddles, each inching her closer to a possible salvation. In order to save her loved ones, Olivia may have to give herself to the enemy. Will Olivia make all the right decisions, or put everyone she has ever at risk?