This is a disquieting book, by the authors of Rickover , about one U.S. intelligence breach after another. Not only have members of key intelligence agencies, the CIA, NSA, and military services sold secrets to the Soviet Union, but counterintelligence efforts are compromised to the point of near ineffectiveness. The picture is one of porous security and slipshod investigating. The authors move from the Pueblo capture, to the John Walker and James Salter cases, to the marines who let KGB agents wander through our Moscow embassy at night. The cases and response of the government are startling. The authors have done a service for journalists, Congress, and concerned citizens. Richard B. Finnegan, Stonehill Coll., North Easton, Mass.