The Naturals (The Naturals, #1)

The Naturals is a series of young adult novels by Jennifer Lynn Barnes. Beginning with a 2013 novel of the same name, the series follows the life of Cassie Hobbes, a 17-year-old girl who is contacted by the FBI to join a special program. The other members consist of Dean Redding, Lia Zhang, Michael Townsend, and Sloane Tavish. Cassie Hobbes' mother was murdered, and they never found the body. One day at a diner where Cassie works, a mysterious boy appears.