The Third Man (Drama, 1949)

"The Third Man" is a 1949 film noir set in post-World War II Vienna, where an American writer, Holly Martins, arrives to find his friend Harry Lime has mysteriously died. As Martins investigates, he uncovers a web of deception, black-market dealings, and a shocking revelation that Lime may still be alive. The film masterfully blends suspense, moral ambiguity, and striking cinematography, culminating in a memorable chase through Vienna's sewers.
Details: Directed by Carol Reed, the movie stars Joseph Cotten as Holly Martins, Orson Welles as Harry Lime, and Alida Valli as Anna Schmidt. It features a famous zither score by Anton Karas and won the Academy Award for Best Cinematography (Black and White).