Wedensday night, Sean Hannity opened his show with a terrific guest—and even let him talk. Bob Hamer was an FBI undercover agent who infiltrated the Russian mob posing as an arms dealer, made the famous bust of the North Korean super-counterfeiters, and spent five skin-crawling years infiltrating the North American Man Boy Love Association (NAMBLA). Despite the made for TV-type danger posed by the first two assignments mentioned above, Hamer’s decided his first superb book, The Last Undercover: An FBI Agent’s Dangerous Dance with Evil, should be about his NAMBLA case, because he felt the most urgency to expose this...