That Sweet Little Old Lady (Paperback) (ISBN-13: 9798888303559)

Usually, the toughest part of the job is stating the problem clearly, and the solution is then easy. This time the FBI could state the problem easily; solving it, though was not. How do you catch a telepathic spy?

In 1914, it was enemy aliens.

In 1930, it was Wobblies.

In 1957, it was fellow travelers.

And, in 1971....