I was musing the current challenge (big YAY! for the return of this comm, btw), when I realized that actuaaaally . . . I already kind of answered it way back when. (Do I have great foresight or WHAT? :P)
Tara travels through the underworld, doomed for some nonspecific reason! . . . Buffy is her spirit guide! . . . Doyle, um, Doyle provides the eyecandy!
Aaand, I named it after a WW1 play. Why? Really, who knows . . .