A successful Russian businessman was killed in a hotel on the Turkish Black Sea coast. None of those who were visiting the deceased that evening fit the role of the killer, and besides, everyone has a cast-iron alibi. Expert analyst Drongo is unwittingly involved in the investigation, and it was he who discovered the traces of the killer. But the traces are not yet the criminal himself, he is somewhere nearby and calmly continues his hunt. Drongo almost caught the killer in a trap. But at the last moment the criminal manages to escape literally in front of the entire task force. And yet Drongo knows: their meeting is inevitable...