Humanity continues to resist the onslaught of the Knackers, carnivorous crab-like aliens whose nomadic fleet is sweeping through inhabited star systems, decimating the populations of entire worlds. At the edge of known space, a solitary SpaceForce destroyer searches desperately for a stranded alien vessel full of human captives. Commanding the Goliath is Captain Taramay Dent, a decorated war hero battling her own demons as she fights against humanity's impending doom. Alone in enemy territory, the ship's crew races against time to complete their rescue before they are discovered. However, things are not as they seem, and they encounter a new danger that threatens their ship from within, one that may lead to the Goliath's destruction — or salvation.

Dark Angels is the fourth book in the continuing Space Adventure Saga created by Ardath Mayhar in her novel, Slaughterhouse World: A Tale of the Human-Knacker War.