In September 1942, the Germans tested the latest high-power weapons on one of the Baltic islands. As a target, the Nazis used a local concentration camp, which was eventually completely destroyed. However, one of the prisoners not only managed to survive, but also to contact the current underground. Information about new weapons of mass destruction reached Moscow. The NKVD leadership orders the group of Major Maxim Shelestov to take possession of secret documentation for the production of shells and, if possible, destroy the plant itself...