well it wasn't realy Eru who brought Gandalf back, it was either Manwe or another one of the Valar, because ha had not finished his mission that ha was sent to do, right?
but, I think it was "mind speech" from one of the Valar, Miar, or elves who were living in Valinor.
also, I think that if Saruman didn't want anyone to find out he was betraying them then they wouldn't. "mind speech" only works if the 2 people are agreeing to comunicate with each other.
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