The quick pitch: Candy, the daughter of a US diplomat, uses her position at an all-girls' school to spy on her friends' fathers and the goings on at their respective embassies. What at first seems like harmless fun goes horribly wrong when a Chinese assassin is sent in to put a stop to Candy's shenanigans.
I wouldn't call 13 Frightened Girls all that good, but I wouldn't call it all that bad either. The film kind of feels like Disney took a stab at making a Eurospy film. I could easily see someone like Hayley Mills in the title role. It's all harmless enough fun, but it does lack any real bite. Even when lead-girl Candy is in danger, you know it'll all turn out all right. Take the scene where the Chinese baddies are searching for Candy in the room full of suitcases. It's downright silly. However, I don't think the film is the disaster some reviews would have you believe. I think the movie gets a knock because of the marketing, the title, and the William Castle name. It's nowhere near as lurid or suspenseful as the trailer or poster art would have you believe.
A couple of other things: First, I got a kick out of seeing Alexandra Bastedo (who would later appear in The Champions) in the background as "England". Second, I'm really surprised to see that Kathy Dunn didn't have more of a career in acting. Whether you like the movie or not, I think Dunn did an outstanding job as Candy.