Rahu in 8th House. 

So, lets see what Rahu can do in 8th house without any conjunction or aspect from any other planet. 1st lets see what these 2 things represent - 

Rahu represents illusion, foreign lands, foreign things (foreign as in unknown things. So, for someone living in Punjab, culture and rituals of Kerala is also unknown and hence Foreign), Drugs, Medicines, any type of intoxication, fame, wealth, success, obsession, past-life left-over karma, movies, television, online world, cheating, imagined fears, unusual things, unique things, creativity, rule breaker. Rahu also blows things out of proportions. 

8th house is house of secrecy, occult knowledge, longevity, transformation, death and re-birth, In laws family, joint wealth with spouse etc.

Aspect-wise, in Vedic Astrology, Rahu has 5th and 9th house aspect. He is unable to impact 7th house from its place as Ketu is sitting there, which is the other axis of Rahu and represents all those things which are non-Rahu. 

When Rahu is in 8th house, it makes a person highly obsessive about hidden knowledge and occult matters. This position can make a person very good occultist practitioner. Besides this, this position can also make someone a secret service agent or spy for government or in private detective services. As Rahu represents Foreign Lands and 8th house is in-laws family, this position gives in-laws in foreign lands. But over-all great obsession for occult and research. They are the perfect mystics

From 8th house, Rahu aspects 12th house & 4th house with its 5th & 9th house aspect.  All these houses are moksha margi. It shows the need to attain knowledge and education in all occult, mystical and spiritual matters. It again supports your life as a mystic. 

Thanks,

Swami Premanand Bharti