the caller

For years, she has lived in the shadows, hiding behind burner phones and anonymous tips, feeding the BAU just enough information to keep them chasing the monsters she once called family. She never gave a name, never stayed on the line too long, and never let them get too close.

Until now.

When a case takes a dangerous turn, she risks everything to stop a killer before it's too late-only to find herself trapped inside the FBI, face-to-face with the very agents she's been guiding from the dark. And when Aaron Hotchner hears her voice, he knows.

The anonymous caller isn't just another informant.

She's the key to taking down one of the most twisted serial killer duos the BAU has ever encountered.

And she's been running from them her entire life.