The stakes are high and not just in the casinos in "Monte Carlo" (1986), a tense, epic thriller set in the years leading up to World War II. Joan Collins stars as a Russian cabaret singer who uses her sexy wiles to spy for the British. She is not alone inher endeavors. The principality is a hotbed of intrigue. Among the players drawn to its orbit are Irish mercenary Malcolm McDowell, struggling American writer George Hamilton, Gestapo secret agent Peter Vaughan, and American pilot Robert Carradine.