Calling the phone number gets nothing, not even an answering machine. This looks like a job for --
-- the police department, which is currently on your side. Ask Officer Palmer to look up the number, and he says it belongs to the Grace Church. Hmm.
Father Ullman, the priest at Grace Church, is trying to be completely unhelpful --
-- but he's also quite careless, and eventually he lets slip the name Michael Cooper. Aha! Search for that name on Rosa's phone to find out more.
Once you know that Michael Cooper was also a priest, browbeat poor Father Ullman again. Eventually -- and I would really hate to have this man carry MY secrets -- he tells you that you can find Michael in the school that's part of the church, which will now be on the map.
Oh, and before you go in to see Michael, you might want to save your game; Michael has a great deal to say, all of it pivotal, and you may want to replay the scene if you miss something.