A dangerous epidemic is breaking out in one of the developing countries of Africa. A Russian team of volunteers is arriving in the country to replace the runaway international medical mission. She is joined by a local infectious disease doctor and a Russian brilliant virology scientist who are working on the production of the necessary vaccine. But an international pharmaceutical corporation is launching a real espionage operation against Russian virologists. The heroes will not only have to fight for their cause, desperately saving thousands of lives, but also figure out the "mole" who has infiltrated their ranks.