Spies Kill Silently (1966)
Plot
Professor Freeman, a distinguished English scientist, is on the verge of a breakthrough in cancer treatment. While he is away on business in Beirut, his daughter tragically drowns in a hotel swimming pool under suspicious circumstances. The local authorities quickly label it an accident, but the case is deemed too sensitive for public scrutiny. As a result, the covert operation is handed over to Special Agent Mikel Brown, who must uncover the truth behind the scientist's daughter's untimely death.
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