Theo Richter is a Dublin investigator who is planning to retire. But he can't relax: as soon as he receives his dismissal, he is called to investigate another complicated case that only he can handle. A couple of tourists from Ireland have disappeared in the New Zealand wilderness. Interestingly, this is not the first similar case in this area. Previously, the bodies of the missing were found near a waterfall surrounded by mystical symbols. Richter's task is to find his fellow countrymen before they end up there too. Diana Guia, a representative of the local police, offers to help him. She has a complicated past and she will have to figure out both her own history and the assigned case.