Riley Williams has never known anything other than a life of an assassin. She knows that being a killer means she will never fall in love. Then comes along Theodore Holt, a top agent from a rival organization. He is dark, compulsive and makes Riley feel things she has never felt before (and never wanted to). When one of the high ranking officers of her group is killed, Riley must band together with Theo in order to protect the people who gave them a purpose. But things aren't as simple as that, a mysterious gang of people want the assassins dead, and they will stop at nothing to achieve their goal.