Russian criminal tattoos carry a grammar most outsiders never learn: stars on the knees mean a refusal to kneel before authority, cathedral domes count prison terms served, and a wrong tattoo worn without earning it can get a man killed. The film traces that language back to the Stalinist Gulag of the 1920s, where prisoners built a rigid social hierarchy inside the camps the state called the Zone and marked rank on the skin. Filmed inside some of Russia's harshest prisons, including the White Swan, it puts cameras on inmates showing off ink that records their crimes, their rank among the vory v zakone, and their contempt for the guards watching them. Interviews with prisoners, corrections officers, and criminologists decode individual symbols and the broader code of thieves that governs who may wear what. The tradition is fading as younger inmates lose the old rules, but the tattoos already on older prisoners' bodies remain a readable criminal record, etched rather than written.