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"Kilas" ("killers") is the nickname of a petty con-man in this standard detective story that starts out as a satire of American film noir. Kilas has a female companion known as Pepsi Rita who sings for their suppers, along with some hooking to increase the daily tally. The underside of life in Portugal is the backdrop for their eventual involvement with a deadly ring of spies. After the pair get entangled in the espionage web, the drama turns from satire to serious as it heads toward a sober ending.