Mantra 1: Om, Ushanhavay, Vajasravasya, Sarvavay, Desandhado. Mantra 2: Tashya-han, Nasi-Ketanam, Uputra-Asam. Most of the Upanishads are actually like this - they're always stories. So why a story? Someone might wonder, so is it historical? Was thereactually a little boy called Nachiketa who went to the house of death and asked these questions? We don't know really.
Swami Sarvapriyananda teaches the Katha Upanishad, which is one of the most popular Upanishads. The scripture concerns the story of a young man who goes to the house of death to find out what happens after death. The reply describes the nature of reality and the meaning of life.