Mercury in the 8th house indicates a person with an analytical mindset, with a research-oriented and perceptive way of thinking. The 8th house is the house of other people's resources (energy, money), the house of death and conception (as a gateway to another world), and the house of crises. Mercury is the planet of analysis and calculation. Accordingly, a person with Mercury in the 8th house may be drawn to financial topics, able to calculate how to invest money profitably and where they can win or lose. Even if they face a crisis in their life, they are more likely to process it through reason than through emotions, analyzing why it happened rather than emotionally reflecting on it.
Such a person may also be attracted to esotericism, occultism, and mysticism. They may enjoy detective stories, psychological thrillers, and complex, convoluted narratives.
This individual may be able to negotiate discounts on things they need, or obtain credit on favorable terms. They can work well with other people's money, potentially as a financial analyst, broker, accountant, or tax organization employee. Their analytical, research-oriented mind can also suit them for roles as a detective, investigator, auditor, or crisis manager.