Preparatory school student Liz resurfaces, disheveled and bloody, after disappearing 18 days prior along with her peers Mike, Geoff, and Geoff's girlfriend, Frankie. Liz is interviewed by a psychiatrist, Dr. Phillipa Horwood. Liz recounts how her friend Martyn arranged for the four to spend the weekend in an abandoned underground Fallout shelter to avoid a school field trip. Liz portrays herself as being unpopular but as Frankie is her friend, she was able to convince the others to go down into the shelter.