To Green Angel Tower is the third book in Tad Williams' epic fantasy series, Memory, Sorrow, and Thorn. As the evil minions of the undead Sithi Storm King prepare for the kingdom-shattering culmination of their dark sorceries, King Elias is drawn ever deeper into their nightmarish, spell-spun world.

Meanwhile, the loyal allies of Prince Josua desperately struggle to rally their forces at the Stone of Farewell. With time running out, the remaining members of the now devastated League of the Scroll have gathered there to unravel mysteries from the forgotten past in an attempt to find something to strike down their unslayable foe.

Whether or not they are successful, the call of battle will lead the valiant followers of Josua Lackhand on a memorable trek to the haunted halls of Asu'a itself - the Sithi's greatest stronghold.