"Speaking of grave mysteries, what was that look you gave Meritxell?  Feel free to answer by Message, or I guess not at all, but exchanging an overt glance where other people could see you suggests that, if this is a Security secret, the existence of that secret is not itself secret."

"Speaking of grave mysteries, what was that look you gave Meritxell?  Feel free to answer by Message, or I guess not at all, but exchanging an overt glance where other people could see you suggests that, if this is a secret Security issue, the existence of that secret is not itself secret."