There are 3 books in the Memory, Sorrow, and Thorn series. The newest book is To Green Angel Tower which came out in 1993.

1
The Dragonbone Chair

Book cover of The Dragonbone Chair
The first book of the trilogy "Memory, Sorrow and Thorn" tells the story of Simon, a kitchen boy and sorceror's apprentice, who must find the solution to the riddle of the long-lost swords of power, in order to combat the evil of the undead Sithi Ruler, the Storm King.
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2
Stone of Farewell

Stone of Farewell
From master storyteller and New York Times-bestseller Tad Williams comes the second book in the landmark epic fantasy saga of Memory, Sorrow, and Thorn.

Tad Williams introduced readers to the incredible fantasy world of Osten Ard in his internationally bestselling series Memory, Sorrow, and Thorn. The trilogy inspired a generation…

3
To Green Angel Tower

To Green Angel Tower
From master storyteller and New York Times-bestseller Tad Williams comes the third book in the landmark epic fantasy saga of Memory, Sorrow, and Thorn.

Tad Williams introduced readers to the incredible fantasy world of Osten Ard in his internationally bestselling series Memory, Sorrow, and Thorn. The trilogy inspired a generation…