Azu
Azu asked Josh Lanyon:

This question contains spoilers… (view spoiler)

Josh Lanyon Many excellent FBI agents are sprinkled throughout the country. The top positions in the Bureau are extremely competitive, extremely sought after, and since--in theory--the FBI only hires the best of the best, it goes without saying that many of the best agents will not end up in in DC or in the more prestigious offices,

We don't know Petty's backstory, but perhaps one of the bonds between himself and Sam was the fact that they both come from rural western backgrounds. We know that Sam has mentioned retiring to Montana, so maybe Petty has a similiar affinity for the west.

About Goodreads Q&A

Ask and answer questions about books!

You can pose questions to the Goodreads community with Reader Q&A, or ask your favorite author a question with Ask the Author.

See Featured Authors Answering Questions

Learn more