The Mackintosh Man (1973)

Synopsis
John Huston directed this cold war spy thriller (from a script by Walter Hill) concerning a British agent trying infiltrate the organization of a nefarious communist spy. Paul Newman is Joseph Reardon, a British secret agent commissioned by Mackintosh (Harry Andrews) to impersonate a jewel thief. When the police are tipped off about his diamond robbery, Reardon is arrested and shipped off to a high-security prison. At the prison, he meets a convicted Russian spy and the two are involved in a prison break, arranged by a mysterious group called the Scarperers. After the successful breakout, Reardon finds himself drugged and sent to Ireland. It turns out that the escapade was organized by Mackintosh in the hopes Reardon could infiltrate the Scarperers and gather information on the group's leader, Sir George Wheeler (James Mason), and prove him to be a Russian spy. ~ Paul Brenner, All Movie Guide