Kati owns Istanbul's only mystery book store and, as usual, gets involved in a case that is none of her business. Every day, a beautiful woman lunches alone in the restaurant next to the bookstore. When the woman is found dead in her apartment, Kati immediately recognizes the stranger from the restaurant in images in the newspaper photos. Although the police believe it was an accident, Kati suspects something more sinister has happened. Sani Ankaraligil was an attractive young woman, in the middle of a divorce from her wealthy husband and a politically active ecologist. So who would benefit from her death? The industrial companies Sani had accused of polluting the rivers of Western Turkey, or her jealous husband seeking revenge through an honour killing, or a Thracian separatist group? The investigation pulls Kati into the murkiest of waters.