13 Frightened Girls

In 1963, William Castle's spy film "13 Frightened Girls" brought a unique blend of espionage and boarding school drama to the big screen, courtesy of teen sleuth Kathy Dunn. Set in Switzerland at an elite diplomatic school for daughters, the film follows the exploits of its titular heroine as she uses her access to various embassies to engage in high-stakes espionage. With a mix of action, adventure, comedy, and music, this Cold War thriller stars Murray Hamilton and Joyce Taylor alongside newcomer Kathy Dunn in her breakout role, before premiering in the US that same year amidst negative critical reviews.