Russian counterintelligence receives information that on the territory of the Baltic states, American intelligence services are preparing a large-scale provocation against Russia. At the same time, in the center of Brussels, under the nose of NATO headquarters, a certain Frenchman Arthur opens a small cafe “Beer Brussels Hippopotamus” . Estonian Lieutenant Colonel Robert Tamm, who holds a high position in the NATO mission, becomes a regular at the pub. Tamm began his military service in the Russian army, fought in Chechnya, and later, as part of NATO, participated in combat operations in Afghanistan and Iraq. In the evenings, after the service, Tamm likes to sit in a cafe and drink a couple of glasses of beer in the company of Arthur. An Estonian is always calm, self-possessed and taciturn. Just like, in fact, the owner of the cafe. It has long become a habit for them - to control themselves and keep their mouth shut. After all, both Tamm and Arthur are Russian intelligence agents, to whom the Center has assigned an almost impossible mission - to thwart the American provocation in the Baltics...