Based on

Movies like Operasi X (1968)

When army intelligence detects an underground movement, Operation X is carried out. Lieutenant Hadi receives a secret mission to penetrate into the underground movement. In order to keep it secret, Hadi breaks up with his girlfriend, Savitri, for the time being. Spies kidnap Savitri as their hostage when Hadi’s dual role is suspected. But then the army moves in to smash the underground movement and rescue Savitri.