Gifted film-maker Thorold Dickinson's wholly fascinating, densely layered assassination plot roiling at the blackened centre of 'Secret People' makes for an uncommonly gripping, tautly scripted, insidiously paranoid political thriller, emboldened with some exquisite ensemble acting from a talented cast, with an especially luminous, visibly limber turn from a sweetly youthful, delightfully vivacious Audrey Hepburn. 'Secret People' has a remarkably dark and gritty atmosphere, having some darkly delicious, nerve-jangling tense interludes, coming to a genuinely thrilling, palm-swealtering exciting conclusion, and it would be foully remiss to ignore the starkly menacing performance by charismatic Italian cinema icon Serge Reggiani as the increasingly dastardly, cruelly manipulative 'Louis', who all too effectively playing the masterfully murderous agitator!