National Intelligence University Recommended Readings list – http://ni-u.edu/wp/recommended-readings/
Representative questions that can be answered with this resource:
- Where can I find a book on the psychology of intelligence analysis?
- Where can I find a general overview of the art of intelligence?
- What are some biases in estimating the probability of a given event?
This is the list of books that are recommended to members of the US intelligence community prior to taking advanced classes in intelligence.
The list is divided into several sections: National Guidance; Intelligence Art, Practice and Strategy; Global Strategic Environment; Research and Writing.
Some of the readings are freely available online. Others would probably be available at your local library or through interlibrary loan.
This list has a good amount of material that would be familiar to your American spy character.