Yuri Spraytyvich has been assigned to the position of Junior Strategic Missile Force Manager at the Čerëmuški Command Post in Chita, Siberia. The responsibilities that come with this posting include managing an aging facility with persistent maintenance failures, navigating worker strikes, overseeing radioactive material handling, and working alongside PERIMETER — the Soviet automatic defensive system that operates under its own logic. When PERIMETER receives a launch order that it should not have received, Yuri becomes the person responsible for preventing it from completing that order, saving the world from a nuclear exchange that nobody authorized.