The story of the Bronfman family is a fascinating and improbable saga. It is dominated by "Mr. Sam," the single greatest figure in the history of the liquor business, the man who made drinking whiskey respectable in the United States and who in the 1950s and 1960s built Seagram into the first worldwide empire in wine and spirits. After Sam's death in 1971, his oldest son, Edgar, maintained the business, though he was distracted by his matrimonial...