There's a secret branch of the FBI that no one except the people directly involved know about. It's called the S.I. which stands for Supernatural Investigators. They hunt down and kill every creature you never could've dreamed was real. And bonus: they get paid to do it! Kate Darvenne just so happens to be one of them. But there was a time before she knew about all of that, before they found her. She was a teenager on the run. She had strange abilities that allowed her to know what or who wasn't human. But she never used them, never helped anyone. Until she met Agents Jackie Melara, Mellie Cook, Bron Davis, Garret Young, and Farren McAllister. When she met them everything changed.