There’s an old unfinished railroad track in North London, just west of Finsbury park and leading up to Highgate Hill. It was supposed to be part of the London Underground, but it was left unfinished and turned into a parkway. At the end of the track is a trio of brick archways, gated with bars. And through those bars, in a special tunnel, some bats live. There’s Kevin, an accountant (and also a bat), Rebecca, a poet (a bat as well), and Harriet. Harriet is not really a bat, but she hasn’t told Rebecca and Kevin yet. She just got really drunk one halloween and lost her way home.