A criminal authority is killed in a restaurant. With the second shot fired during the ensuing commotion, a sniper also killed a random passerby—the lawyer Galina Rodionova. The second killing looks like an accident. But Colonel Gurov from the Ministry of Internal Affairs is sure that the killer’s primary target was the woman. Checking potential ill-wishers of lawyer Rodionova yields nothing. There were no potential enemies among her acquaintances either. Gurov rules out one version after another until he learns of one oddity linking the murdered woman and her own sister…