Aurora Hill works for the secret spy organization known as The Underground. When a deadly assassin begins to pick off the organization's best agents one by one, Aurora is assigned the job of eliminating him. But with Interpol hot on her trail, and her sister's murder bearing down on her, can Aurora rise to the occasion? To top it all off, The Underground is keeping vital information from her that could change everything she thought she knew. Aurora will have to face many dangerous threats in order to find the assassin---and the truth about her sister's death.