Nancy's old friend Alex Burgess is making a movie, and it's filming in River Heights! On the first day of shooting, Alex invites Nancy, Bess, and George on set for a behind-the-scenes peek at how a movie is made. George is excited for a closer look at the cameras and special effects, and Bess is mostly around to get a glimpse of the film's leading man: handsome actor Brian Newsome! But right before the camera starts rolling there's an explosion in the catering area. Turns out someone put firecrackers in the coffeemaker. Not too long after that, Brian's costume is found streaked with blood. And threatening notes show up scrawled on the scripts. Can Nancy track down the set saboteur before the film's dangerous final scene? Or will the entire production go up in flames first?