In December 2008, the world watched as master financier Bernard L. Madoff was taken away from his posh Manhattan apartment in handcuffs, accused of swindling thousands of innocent victims-including friends and family-out of billions of dollars in the world's largest Ponzi scheme. Madoff went to jail; he will spend the rest of his life there. But what happened to his devoted wife and sons? The people closest to him, the public reasoned, must have known...