The author endured a firestorm of criticism from fellow journalists when, as editor-in-chief of Time Inc., he turned over Time reporter Matt Cooper's notes on confidential sources in the Valerie Plame scandal to special prosecutor Patrick Fitzgerald. In this defensive apologia, he explains his reasons for defying what he allows is a hoary journalistic tradition of going to jail to protect sources. Pearlstine, who holds a law degree, cites a high-minded conviction that “journalists aren't above the law,” but admits that the “tipping point” in his decision was his formulation of a hairsplitting legalistic distinction between “confidential” sources, who should be protected, and mere “deep-background” anonymous sources, who can be given up to the grand jury. Along the way, he discusses at length the critics who accused him of putting Time-Warner's profits above journalistic principle as well as New York Times reporter Judith Miller, who went to jail to protect her Plame sources (before finally testifying). He also raises some cogent points about journalists' abuses of anonymous sourcing conventions. Readers already persuaded of Pearlstine's pusillanimity may find his lawyerly self-justifications less than convincing. (Aug.)