Synthesized answer
The provided passages do not contain information about what questions remain unanswered in "The Remains of the Day".
The passages describe the premise of the book, stating that the butler Stevens takes a holiday into the countryside and into his past in the summer of 1956 [1]. They also characterize the novel as a "beautiful and haunting evocation of life between the wars in a Great English House, of lost causes and lost love" [1]. However, these descriptions do not reveal any specific unanswered questions within the narrative.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: The Remains of the Day by Kazuo Ishiguro Description: In the summer of 1956, Stevens, the ageing butler of Darlington Hall, embarks on a leisurely holiday that will take him deep into the countryside and into his past . . .A contemporary classic, The Remains of the Day is Kazuo Ishiguro's beautiful and haunting evocation of life between the wars in a Great English House, of lost causes and lost love.