Collects Ghostbusters: The Other Side (2008) #1-4. Cover by Nick Runge. The only thing worse than getting on the bad side of gangsters is capturing the ghosts of the some of the most historically notorious figures in organized crime. And when you upset the spirits of the mafia, you better be prepared to go to the mattresses. But when the Ghostbusters find themselves in Purgatory they need to find a way out, and fast, before they end up spending an eternity in Hell.