What is the main conflict in The Pianist: The Extraordinary Story of One Man's Survival in Warsaw, 1939-1945 by Wladyslaw Szpilman?

"The Pianist" by Wladyslaw Szpilman tells the true story of a Jewish pianist who lived in Warsaw, Poland during World War II. This is the story of his family and of his survival during the war as the Germans invaded his city.