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A number of bodies are being discovered around Vienna and Niki and Marc link them to an illicit group who call themselves 'Ars Moriendi' (Latin for the 'Art Of Dying'). The group is comprised of members who pay huge amounts of money to watch two other members engaging in a lethal game in the course of which one of the two members will die.
Bets are taken by the organisers, and it is very big business indeed. It takes all the resources of the Vienna Murder Squad to track down the organisers of the group and their associates.