A Song of Ice and Fire takes place on the fictional continents Westeros and Essos. The point of view of each chapter in the story is a limited perspective of a range of characters growing from nine in the first novel, to 31 characters by the fifth novel. Three main stories interweave: a dynastic war among several families for control of Westeros, the rising threat of the supernatural Others in northernmost Westeros, and the ambition of the deposed king's exiled daughter to assume the Iron Throne. Martin, who initially envisioned the series as a trilogy, has published five out of a planned seven volumes. The fifth and most recent volume of the series, A Dance with Dragons, was published in 2011, six years after the publication of the preceding book, A Feast for Crows. He is currently writing the sixth novel, The Winds of Winter. A seventh novel, A Dream of Spring, is planned.