Three acts of domestic terrorism in six weeks.

A school shooting. A water treatment plant bombing. A courthouse attack. The perpetrators had no criminal records, no extremist ties, no warning signs. Six months ago, they were ordinary citizens.

FBI Behavioral Analyst Maya Castillo finds the connection: all three used Sentinel, a "civic engagement platform" that claims to reconnect divided communities. In reality, Sentinel maps each user's psychological vulnerabilities and feeds them a custom radicalization pipeline. Eight weeks from concerned citizen to weapon.

The platform leads Maya to a think tank with connections reaching into Congress — and to someone she was never supposed to find.

The technology is real. The radicalization is invisible. And by the time you realize it's happening, you can't remember who you were before.

Book 3 in the Maya Castillo Series — for fans of Michael Crichton, Blake Crouch, and Don Winslow.