The Dark Treaders
by Esther Mendell
Lizzla, after living her whole life in a sunless world, has a startling fate dropped upon her. A strange man with cat ears runs off with one of her books and she if forced to hunt him down. To do so she must follow him through a doorway into another world. In moments, she is drawn into a fight to save the other galaxies from being lost in the same destructive darkness.