The tale to end all tales, well the tale about other tales. That's the one! All the other stories in Tales of the Vampires is just a tale being told by the vampire Roche. But he is not the center of this story. That would be Giles Mother.
Joss Whedon wrote this tale full of twists and turns. The watchers take these young soon to be watchers to go and learn the tales of vampires from this vamp. She just feels something is wrong but can't figure it out. No one else there seems to think that anything is out of place.
As Edna, Giles mom, listens to Roche's story she figures out that the other little girl is in fact his sire. She slays the sire and is knocked out. When she wakes up everything is under control and she blows up at the watchers, pointing out how pathetic they all our. She leaves and makes her way to a nearby Bakery, a bakery run by a family with surname Giles. Where she has a crush on the oldest son.
It's a great story that serves as a kind of origin story for Giles, kind of.