Seventeen-year-old Cassie is a natural at reading people. By piecing together the smallest details, she can tell you who you are and what you want. But this is not a skill she ever takes seriously. That is, until the FBI showed up: they've started a secret program that uses exceptional teenagers to investigate secret, terrible cases, and they need Cassie. What Cassie didn't realize was that the case was more dangerous than several unsolved murders - especially when she goes to live with a group of teenagers whose powers are as unusual as hers. Sarcastic, arrogant Michael is a deft reader of emotions, which he uses to get inside Cassie's head—and under her skin. Brooding Dean, like Cassie, is an expert at profiling, but keeps her at a distance. It soon becomes clear that everyone in the Naturals program is not who they seem. And when a new killer makes his move, danger looms closer than Cassie could have imagined. Engaged in a deadly game of cat and mouse with a killer, the Naturals must use all their abilities just to survive.