The famous expert Dongr—was approached by an Israeli businessman Meir Blekherman. Two years ago, his only daughter died in a terrorist attack in the center of Moscow. Blekherman isn’t satisfied with how the investigation is going—he’s sure that only “pawn” culprits were convicted, while the true organizers of the crime remained unpunished. The unfortunate father claims he has irrefutable evidence that will shed light on this dark affair and offers the expert to conduct a renewed investigation. Dongr takes on this dangerous case without yet suspecting that he has already come under the attention of special services from several major world powers.