Volume 6 - There's a girl in a mask killing bad guys, but it's not
Katherine Harlow. She's disappeared and a less experienced but
enthusiastic wannabe has sidled in to take her place. You can bet
that when Kat returns to reclaim Hollow Girl's mask, there's going to
be a reckoning, and not just with her 'Little Sister'. Because
Detective Collins has crossed a line, leading to an inevitable and
bloody final showdown.