The action takes place in 1918 in Perm. Central Siberian White Guard Corps, under the command of young general Anatoliya Nikolaevicha Pepelyaeva exciting city. The army exhausted, not enough ammunition, uniforms, provisions. General invites the Permian merchants in order to collect money for the army. Wealthy widow Chagin brings as indemnity expensive diamond. The next day, the diamond mysteriously disappears. In search of attracting sentenced to death red investigator Andrei Murzin, who must find a diamond in exchange for a pardon.