Here's how we can categorize it:
* Horror: This is the most obvious and prominent genre. The story utilizes suspense, psychological tension, and a sense of dread to create a chilling experience.
* Psychological Thriller: The story focuses heavily on the protagonist's mental state and how she reacts to the unsettling events. It delves into themes of paranoia, fear, and the fragility of sanity.
* Radio Drama: Originally written for radio, "The Hitchhiker" relies heavily on sound effects, dialogue, and vivid descriptions to create a visceral experience for the listener.
You could also argue that it has elements of:
* Mystery: The identity and motives of the hitchhiker remain shrouded in mystery until the end.
* Suspense: The story builds tension steadily, with a sense of impending danger that keeps the reader on edge.
Ultimately, "The Hitchhiker" is a multi-layered and effective horror story that draws on multiple genres to create a truly chilling experience.