On the night of the 11th of July, two guardsmen from the Serbian elite unit are making their rounds in the Topcider military camp. The next morning, they are found dead. The military court issues an official report claiming that they were the victims of a dishonourable ritual suicide, and the investigation is promptly closed. Lawyer Sinisa Stojkovic is commissioned by the parents of the dead guardsmen to launch a private investigation. He asks his old friend, Milena Lukin, a specialist in international law, for her assistance. But her investigations start to irritate certain individuals, and her life ends up in grave danger. A dreadful suspicion begins to build: it seems that the guards saw something they shouldn't have seen. Could it have had something to do with the anniversary of the worst massacre in European history since World War II?