When fourteen-year-old Ella Carmichael is killed by a cyberstalker, her sister Krista vows to protect others from falling into the same trap while she hunts down the online predator.

"Audrey Miller has an enviable new job at the Smithsonian, a body by reformer Pilates, an apartment door with a broken lock, and hundreds of thousands of Instagram followers to bear witness to it all. Having just moved to Washington, DC, Audrey busies herself impressing her new boss, interacting with her online fan base, and staving off a creepy upstairs neighbor with the help of the only two people she knows in town: an ex-boyfriend she can't stay...

"The daughter of a U.S. Senator is monitoring her social media presence when she finds a picture of herself on a strange blog. And there are other pictures... of the children of other influential Washington politicians, walking or standing outside their schools, each identified by name. Surrounding the photos are texts of vicious political rants from a motley variety of extremist groups. It's obviously alarming -- there's an unstated but deadly threat...