A horrifying message turns a holiday gathering tragic. An unsolved murder hangs a death threat over Detective Andy Stewart's head. And internet-fueled hatred targets Will and Andy's friend Lane. Will and Andy struggle to keep the ones they love safe, while hunting a dead murderer before he can kill again. As the tension tightens, Will confronts a troubling revelation about the extraordinary after-effect of his midair collision.

The Essex County crew meets deadly threats with courage, invention and biting humor on a non-stop adventure that confronts rabid racists, scheming media manipulators and an international conspiracy aimed at disrupting the American political process.