You're likely thinking of
Francis X. Cavanagh, not Cavanaugh. He is a prolific author, and it's difficult to list everything he has written without more context. Could you clarify your question? Do you want a list of:
* All his books? This would be very extensive.
* His most famous works?
* Books in a specific genre?
* Books written for a specific audience?
Please provide more details so I can give you a relevant answer.