You've piqued my curiosity; what sort of detective must return to high school?
Not a profiler, exactly, no. I had a reputation of being a very successful psychiatrist with slightly avant-garde methods, and so the FBI approached me to help them on a peculiar case.
The detective with whom I worked had a very strong sense of empathy, which made working with the crime scenes difficult for him, and so I was there for him as much as I was for the FBI.