Heimdall: The Norns are three women born around the same time as my father. They can see the future, past, and presant. Through the ages they have given us prophecies, and have never been wrong. The other two died very recently, which is very dire news. They are guides, and do not share everything they know. In many ways they are a mystery to even us.
Idun: When the Time Matrix was hidden, I would guess an oath was taken never to reveal it's location. If that is so and the Norn was involved she will never reveal it's location.
"Dulce bellum inexpertis."
Official Forum Expert on Norse Mythology
As Odin says in the Hovamal:
"Praise no day 'til evening; no wife 'til on her pyre; no sword 'til tested;
no maid 'til bedded; no ice 'til crossed;
no ale 'til drunk."