This retargeting campaign realised the concept of a ZDF online murder mystery drama to gain users through the Web. It was created against the backdrop of a younger target group of individuals aged 20 to 30 who prefer to surf the Internet instead of watching TV. The idea was to stage a gripping crime drama in the form of online display ads, but without users having to click their way through to the next clue. Instead, they could track down the clues on major websites for one week by using intelligent retargeting. In the displays, the online detectives followed clues, collected evidence, cracked mobile phone codes and ultimately solved the case.