A Tri-City beach becomes a place of dramatic discovery when the sea washes up the body of a young girl. The victim's unusual mutilation points to murder. The investigation is headed by an ambitious and tenacious prosecutor, Leopold Bilski. The victim's mother, Judge Helena Bogucka, is also involved in the investigation. All clues lead to one of the seaside clubs, which turns out to be related to the murder of a woman from 15 years ago. From the information collected during the investigation and the evidence concealed for years, the dark face of the criminal Tri-City slowly emerges. Bilski and Bogucka's discoveries begin to be very inconvenient for the local police. 三城海滩上，海水冲来一具年轻女性尸体，受害者身上的异常创伤暗示着这是一起谋杀案。调查由雄心勃勃、不屈不挠的检察官Leopold Bilski牵头，受害者的母亲和法官Helena Bogucka也参与了调查。所有线索都指向一个海边夜总会，而这个夜总会和15年前的一桩女性命案有着千丝万缕的联系。从调查中搜集到的信息和多年来被掩盖的证据，逐渐揭开了三城犯罪的黑暗面纱。Bilski和Bogucka的发现开始让当地警方感到十分棘手。
