3 Works in Primal Fear (1996)
Aaron Stampler was a good boy and Father Zacharias fell in love with him, flashbacks, takes place after they find out about the tape and Roy, Aaron has multiple personality disorder.
Vail can't confront the truth about his client. As the trial nears its conclusion, Aaron’s father pays him an unexpected visit in jail. Roy surfaces, and it’s up to Martin Veil to get his unstable client under control.
Pre-canon (very). No real spoilers. Blithely ignores the book.