The novel "A Rainy Night" by Osama Al-Muslim revolves around a young woman named Deem who moves to a new city to study and lives alone. The story begins one rainy night when she hears knocking on the door. A young man named Hatem appears, claiming to be concerned for her safety. He then begins to unleash strange and frightening events that completely alter the course of her life, revealing secrets and forcing her to confront unexpected fears.