Love Among Thieves (1987)

Caroline DuLac a baroness and concert pianist steals three jewelencrusted Faberge eggs from a San Francisco museum The eggs were demanded as ransom for her kidnapped fiancé She boards a plane for the Latin American city of Ladera as per instructions and is met by Mike Chambers Caroline first believes that Mike is one of the kidnappers until a mysterious man in a trenchcoat tries to kill her and Mike comes to the rescue They are then both captured by a band of Mexican bandits who also may or may not be part of the scheme