In this classic film noir, a car explosion on the U.S.-Mexico border sets off a complex investigation led by a Mexican drug enforcement official, played by Charlton Heston. The plot thickens as he encounters a corrupt American police captain, portrayed by Orson Welles, who also directed the film. The movie is renowned for its intricate narrative and a famous opening tracking shot that has been widely studied in film schools. Janet Leigh also stars, adding to the film’s allure. Although it didn’t win any major awards upon release, it has since been recognized as a masterpiece of the genre. You can watch it for free on 123Movies / Movies123.