The Origin Series by June Gray, Wilette Youkey

She will never be the same again... Olivia King's life transformed the day she entered a bank in Harlem and shook Daniel Johnson's hand, but he abandoned her in her time of need and fled the city without even an uttered goodbye. In the months after his disappearance, Olivia learns to fight and, in the process, becomes her own hero. But something mysterious is developing beneath the city, and it could very well change the course of history... moreShe will never be the same again... Olivia King's life transformed the day she entered a bank in Harlem and shook Daniel Johnson's hand, but he abandoned her in her time of need and fled the city without even an uttered goodbye. In the months after his disappearance, Olivia learns to fight and, in the process, becomes her own hero. But something mysterious is developing beneath the city, and it could very well change the course of history. Olivia discovers that the dead never stay gone and secrets never stay buried. By the end, she and her beloved city will never be the same again. less