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High Treason is a British espionage thriller filmed in the style of such American "docudramas" as The House on 92nd Street. Enemy saboteurs infiltrate the industrial suburbs of London, intending to plant high-powered bombs at several factory sites. Their motivation is to cripple the British economy and enable subversive forces to insinuate themselves in the government. The saboteurs are thwarted not by the traditional counterintelligence agents but by workaday London police officers. Director Roy Boulting also cowrote the screenplay of High Treason, which moves swiftly enough for its plot inconsistencies to be ignored.