There really is no honour among villains, as Isadora learns when the prestigious Villain's Ball is robbed. When the same happens to the slightly less prestigious Hero Anniversary, too, she's even blamed for it. To clear her own name and that of Lisabet, too, she has to investigate the robberies, even if it might set her up as an enforcer.
The Medusa Serum
One person turning into a statue might be a freak accident, yet when it happens to two from different sides of the whole hero-villain game, no less , it's much less of an accident. Isadora has to find the modern Medusa before she can turn more people to stone perhaps even Isadora's brother and nemesis.
The Lich's Lair
One thing Isadora usually doesn't have to think about is other necromancers, as she's the only one working. Yet, a trip to the Black Forest proves to be a bad idea when she stumbles upon a lich's lair and inspires it to walk out into the world and do what it has done before: enslave humans. Now she has to find a still-beating heart and a way to stop it.