Dirk Gently’s Holistic Detective Agency by Douglas Adams
This is a typical murder mystery. The owner of a corporation dies and the one due to inherit looks guilty. Did I say typical, it was written by Douglas Adams, so it isn’t. This story involves a software program that converts business data into music, a detective who is in denial of his psychic abilities, a dead guy, a horse, an electric monk, and – as is typical for Douglas Adams, a perfectly ordinary sofa.