The Raven's Glory
Mirielle raises her eyebrows at the veiled threat of the note, but thanks the waiter and heads back to the temple's library. While there, she sets up a copying spell on one of the more intriguing books she found that morning before diving back into her research.
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TFO, you mentioned that there were several interesting books Mirielle came across. If there were any that might lead to vestige binding, I'll go with that. Otherwise, something related to undead/deathless/other ways of cheating death, or funerary rites.
Edit: And, of course, she'll ask permission first.