In the midst of preparations for a critical mission, Leland Andersen can't afford the return of a childhood nightmare. Yet night after night the vision torments him, of an astronaut dying in flames.

Nora McKinzie is a Houston police officer — and a member of an ancient order founded to fight eldritch entities wherever they might flee. When she receives a warning that a sworn enemy is on the move again, her obligations come into conflict with each other.

Both of them are present when Johnson Space Center comes under attack by terrorists. And they both know that the official explanations don't hold together.

Two people, one deadly secret — and an enemy from beyond time and space.

A novel of the Grissom timeline.

Previously serialized under the title A Separate War.