Following the events of Red Vengeance, now Lieutenant Randy Knox is captured by the alien Creepers. What he finds in Creeper captivity is horrific in many ways, with human living as weird prisoners, typically without defined parameters for their captivity, and no prospect of change.
While the book does provide a conclusion to the Dark Victory series, the whole thing goes out with a whimper. Much of the action seems unrelated to the main story, only serving to vaguely illustrate the fact that the Creepers are aliens, and as such do not have easily fathomable behaviours or motivations. This turns the novel into a bit of a slog, in sharp contrast to the previous books.
In the first two books, the Creepers were a faceless evil. Once the evil is explained, it comes out as rather anticlimactic, with an ending that feels tacked on and unsatisfactory.