Kirsty Young's castaway is American crime writer James Ellroy.

His books have been translated into 30 languages and, according to the New York Times, he is the author of some of the most powerful crime novels ever written.

But the case that has dominated his life and much of his writing was the murder of his mother when he was just ten years old. In the years since, he has tried to find a way of getting to know and understand her.

Record: Beethoven's Piano Sonata No. 29 'Hammerklavier', Op. 106