Book/Novel Source - George R.R. Martin's A Song of Ice and Fire book series
A TV show has the benefit of being much more long form, and therefore a great place to showcase something based on a book or a series of books. With television adaptations of books writers have the ability to develop character properly and the audience have the ability to learn love and live with characters for the long haul, just like in a novel or series of novels.
Which is your favorite TV show based on a book?