A former direct of mine is job hunting and has asked me for a reference. And I am happy to say it would be a glowing reference.
He does not want his new boss to know, and because I have been promoted and moved to a different area in the company, he obviously feels there is enough separation there.
I, however, am now a peer of my old boss (and the boss of the refereee's boss) and need to work closely with her. I also know that she, as well as our company director, would be extremely upset to see this person leave. I believe they would make some sort of counter proposal if they knew the refereee was a flight risk.
I am I right to keep this thing a secret between myself and the referee? Or do I have an obligation to let "the company" know that they are about to lose a high performer?