guilt

Loyalty, vengeance and forgiveness are recurring themes — those, and plenty of guilt, as one would expect of a story featuring a man who spent eight years as a Catholic priest before joining the FBI.

In among the criminal antics and police work is a lot of talk about life and death and God, guilt and forgiveness.

"I didn't raise it at the time and, for years, I carried a lot of guilt about that," he said.

It might feel natural to apologise, even if it's not your fault, but saying "I'm sorry" can sometimes be taken as an admission of guilt.

"I don't think the people that do this feel any guilt and responsibility," Rachel says.