The third of Costa-Gavras's paranoid/political thriller collaborations with Yves Montand for me to get to. Franco Solinas wrote the screenplay in consultation with Costa-Gavras.
Set in Latin America (some signage says Montevideo, Uruguay) where everyone unfathomably speaks French and United Fruit calls the shots. Family-man Montand presents as a technician with USAID cover who liaises with regional police forces on topics of communications and traffic. So far so The Quiet American (1955) but the local left wing is sufficiently organised to discern his involvement in violent reactionary activities. They abduct him and two (eventually three) others. His interrogation (a non-violent interview) is brisk and lays out the facts for us as he issues mechanical denials until an eleventh-hour crater. Concurrent events in the outside world show the limitations of the revolutionaries' opsec and failure of their strategy: their ultimatum only yields a loss of the moral high ground.
Apparently this was shot in Valparaíso and Santiago, Chile during the brief reign of Salvador Allende, based on the actual abduction etc. of Dan Mitrione. The cinematography is once again serviceable and improved by Françoise Bonnot's editing. There are some negative-space portraits of the kind that Sergio Leone made famous. Of the actors, O.E. Hasse has the most fun as a knowing journalist.
Roger Ebert: three-and-a-half stars. Wikipedia.