Max, Nellie and Janosch, are vapid, privileged twenty-somethings who don't like to think about much else but partying. When they hear of an illegal rave at a secret location, they are excited to go. Their destination: the catacombs, a system of tunnels underneath the central station, below the picturesque city of Munich, undisturbed by the authorities. But something goes horribly wrong when a fire breaks out. Dozens are injured in the ensuing panic, some go missing. At the same time, four bodies appear on the banks of the river, draped as if they were ritually executed. And with Max missing since the fire, will he be the next victim? An invisible web seems to be spinning from a real estate tycoon to the shadowy figures living in the catacombs. And the investigating police inspector hides a dark secret in her basement… Nellie and Janosch will have to get to the bottom of it, not only for Max' sake, but also for their own. United against a common enemy – or so it seems, because soon it's not clear anymore who they are up against at all.