Months after his violent death, the already heavily mummified body of the young professional surfer Peter Bachmann is found by sewer workers. In the search for clues, Inspector Brandtner finds what he is looking for in the victim's computer: Bachmann was apparently very busy chatting and offered himself as a playmate to couples in a sex chat room. Of course, his contacts have remained anonymous and have used online names. In order to expose them anyway, Kunz, Böck and Brandtner offer themselves as sex objects on the Internet. The reactions are varied, but before the investigators can record a success, another chatter is found murdered in his car. He was in contact with the same couple – codenamed "TwoForYou" – as Bachmann. Brandtner arranges a meeting with the couple...