When a Soviet submarine gets stuck on a sandbar off the coast of a New England island, its commander orders his second-in-command, Lieutenant Rozanov, to get them moving again before there is an international incident. Rozanov seeks assistance from the island locals, including the police chief and a vacationing television writer, while trying to allay their fears of a Communist invasion by claiming he and his crew are Norwegian sailors.

At first, Dr. Sidney Schaefer feels honored and thrilled to be offered the job of the President's Analyst. But then the stress of the job and the paranoid spies that come with a sensitive government position get to him, and he runs away. Now spies from all over the world are after him, either to get him for their own side or to kill him and prevent someone else from getting him.

Three friends find a secret tunnel under the ruins of a church that leads them to the basement of a dilapidated house and, incidentally, a group of counterfeiters.