La fièvre monte à El Pao (1959)

In the fictitious island of Ojeda, people lives a dictatorship and the island is a penal colony with ordinary and political prisoners together. When the Governor Mariano Vargas is murdered by a sniper, his idealistic secretary Ramón Vázquez is assigned director of security in charge of the prison. Vázquez is in love with the widow Inés Rojas and they have a love affair. But when the new governor Alejandro Gual Miguel arrives in the island, he wants Inés to be his lover. Further he forces the killer to sign a false confession telling that Vázquez is the responsible for the attempt against the previous governor and blackmails Inés. But Inés is a female fatale that knows the political games and manipulations.