They're always watching.
Special Agent Kerri Elias joined the Boundary Enforcement Agency—"The Boundary"—three years ago, trying to escape the ghosts of her past and fight the Black-eyed Children, a mysterious, implacable foe who impersonate young children in order to abduct humans. She's frustrated, though, by a sense that she's spinning her wheels, contributing little toward the mission—until the night her partner is captured before her very eyes.
His disappearance catapults Kerri into a world of shadows, betrayals, and intrigue, where not all of the enemies have the Children's signature obsidian eyes. She's thrown together with three people whose loyalties are uncertain at best—her boss, the blustering Special Agent in Charge Harlan "Duke" Rendell; his tough-as-nails, second-in-command Danielle Tauriac; and newcomer Aaron Vincent, a handsome, young agent just transferred in from the Atlanta field office who may be hiding as much as he's telling.
Through it all, Kerri is forced to contend with the ever-present threat of the Black-eyed Children and a growing sense that she's next on their hit list. Do they know something she doesn't? Or could the handwritten note left for her on a desolate hillside in the New Mexico desert be correct, and she really is the only person on Earth who can save humanity from total annihilation?