Hollow Girl: Iscariot (Hollow Girl #10)

After a nasty case of demonic possession, Hollow Girl has disappeared. That means it’s time for Little Sister - the Hollow Girl copycat - to step in once more. But when she’s cornered by a particularly dogged detective with a personal axe to grind, the only choice is betrayal. If this crazed fan wants to stay out of jail, she’s going to have to use her obsessive knowledge to help bring down the real thing - Hollow Girl versus Hollow Girl.