I Confess is a 1953 Hitchcock film about a priest who hears the confession of a murderer and winds up the leading suspect of that same murder. He must choose between keeping the seal of the confessional or exposing what he knows to save himself from prosecution. Hint: You'll be proud of his choice.
BTW in case you didn't know, a priest cannot reveal to others what you say in Reconciliation no matter what. He can't even bring it up to you outside of the confessional unless you bring it up first.