I Confess

An Alfred Hitchcock film.
A Catholic Priest hears the confession of a murderer, and is bound to silence by Church law, even when interrogated by the police. This is not too difficult, until someone says they saw a priest leave the building. Now all signs point to him.
He must not say who actually did it, he must not say that he knows who did it, he must not say why he cannot speak. He cannot even hint that he ever heard the man's confession. Unfortunately, the murderer is content to let his parish priest be suspected.
If you have never seen this exiting/frustrating depiction of faith, hope and love, I strongly recommend it.