It's a cold winter in the late 19th-Century and London is being ravaged by a new threat. Whispers are circulating about a sinister, young vampire with large aspirations. Enter Agatha, an experienced French slayer whom The Watcher's Council has entrusted with finding the vampire and eliminating him before his plan can come to fruition. Agatha has been fighting evil all of her life and she's beginning to feel her age catching up with her, but both she and her Watcher, Charles, know that there is no retirement for the slayer. Can Agatha defeat this mysterious enemy, or will she finally succumb to the fate of the many slayers before her?