Kazuo Ishiguro, who has won the Man Booker Prize and been awarded the O.B.E., has been called one of Britain’s most important living novelists. His latest, The Buried Giant, examines the frailty of collective memory with the story of an elderly post-King Arthur era couple on their way to visit their long lost son. Their memories aren’t altogether reliable. In this interview with Steve Bertrand on Books, Ishiguro says ours aren’t either.