Pillars of the Earth by Ken Follett
Book 1 of 3
The Pillars of the Earth tells the story of Philip, prior of Kingsbridge, a devout and resourceful monk driven to build the greatest Gothic cathedral the world has known . . . of Tom, the mason who becomes his architect--a man divided in his soul . . . of the beautiful, elusive Lady Aliena, haunted by a secret shame . . . and of a struggle between good and evil that will turn church against state and brother against brother.
A spellbinding epic tale of ambition, anarchy, and absolute power set against the sprawling medieval canvas of twelfth-century England, this is Ken Follett's historical masterpiece.