What is the main conflict in The Remains of the Day by Kazuo Ishiguro?

Kazuo Ishiguro's third novel, The Remains of the Day, earned the 1989 Booker Prize, England's highest literary honor. The book is, in effect, a character study of Stevens, an aging butler who has spent thirty years in service at Darlington Hall. As he considers his past, he is forced to come to terms with the gravity of the sacrifices he has made in the name of duty.