Soon after a junior officer sold secrets to the Soviets enabling them to decipher coded American submarine communications, a Soviet missile sub on a mission near Hawaii sank with all hands in February1968. Two weeks later, a spy reported that a damaged U.S. submarine had arrived in Japan. Soviet files reveal and interviews confirm that high Soviet officials believed it had deliberately sunk their vessel. In revenge, they torpedoed the Scorpion on May 27, killing ninety-nine men. This engrossing overview of American and Soviet submarine operations included capsule biographies of the Scorpion's captain and many of its crew and families.