The Road to Corinth (1967)

In Greece, the radar and missile systems are jammed and surveillance is intensified. When the magician Pericles and his car are searched by the authorities, a mysterious electronic black box is found. They learn from Pericles that other boxes have arrived in Greece; then he commits suicide, eating his poisoned cigar. NATO Agent Robert Ford follows a lead and contacts a man named Alcibiades at the Corinth Port and he asks one thousand dollars to tell the whereabouts of the black boxes. However, he is discovered by his boss Kalhides and a killer shoots him and he falls off in the sea. Robert meets his wife Shanny in their room at the Hilton Hotel, but is murdered by the killer that frames Shanny and she is accused of murdering her husband. Robert's chief of the intelligence, Mr. Sharps, hits on Shanny and releases her from the prison. However, Alcibiades had visited her in the prison disguised as orthodox priest and demands one thousand dollars to tell her the whereabouts of the black boxes. Sharps does not believe Shanny and assigns Robert's partner, Agent Dex, to keep her under surveillance. But the stubborn Shanny is decided to find the culprits to revenge her husband and prove her innocence.