For interesting reading you might try the following:

• Gilbert, Martin, Churchill, A Life, Holt & Co., N.Y., 1991
• Churchill, Winston S., The Second World War, Vols. 1-6, Houghton Miflin, Boston, 1948
• Manchester, William, The Last Lion: Winston Spencer Churchill, Visions of Glory, 1874-1932, Dell, New York, 1983
• Manchester, William, The Last Lion: Winston Spencer Churchill, Alone, 1932-1940, Dell, New York, 1988