Santiago Suarez is needed in the Green room!

How does one go about tracking down an old, cursed Unseelie fugitive who could be anywhere? I'm almost certain he's the entire reason this ballet it fatal, though I don't know how considering he would be old and frail by now. This ballet hasn't killed anyone yet, but we've only just gotten started. Marsden isn't helping at all and he only made things worse with Bellatrix by having Julian arrested.
Now, Bellatrix and Ivory have upped their antics. If this ballet doesn't kill Bellatrix, I might.