The whole of Flensburg is on its feet, as the Rum Regatta takes place again this spring. The event annually attracts sailors from all over the world to the Baltic Sea. However, the good mood is abruptly shattered when the body of a young African man is found at the dock. A suspect quickly emerges: a drunken classmate of the victim is picked up not far from the crime scene. At the same time, a derogatory sign found with the body suggests a racially motivated crime. Once again, detectives Helene Christ and Edgar Schimmel cannot initially agree on the direction of their investigation. Meanwhile, Helene's personal life is also in turmoil. The question of their shared apartment leads to a heated argument between her and her boyfriend Simon Simonsen. Then, a tip from the LKA reveals that a ship at the Rum Regatta is merely a cover.