Claim: A Game of Thrones is part of a popular book series.
Evidence: A Game of Thrones is the first novel in A Song of Ice and Fire , a series of fantasy novels by American author George R. R. Martin.
The fourth and fifth volumes reached the top of The New York Times Best Seller lists upon their releases.
As of April 2015 , the books have sold more than 60 million copies worldwide and , as of January 2017 , have been translated into 47 languages.