premise: The Winds of Winter is the sixth novel in a series.
hypothesis: A Song of Ice and Fire is a series of epic fantasy novels by the American novelist and screenwriter George R. R. Martin . The Winds of Winter is the forthcoming sixth novel in the epic fantasy series A Song of Ice and Fire by George R. R. Martin . `` The Winds of Winter '' is the tenth and final episode of the sixth season of HBO 's fantasy television series Game of Thrones , and the sixtieth overall .