JKR has updated her site today -- WEBSITE SPOILER!

[esmith222002]

No: HPFGUIDX 158297

--- In HPforGrownups at yahoogroups.com, "justcarol67" <justcarol67 at ...> 
wrote:

> 
> If we take PoA at face value, however, Snape didn't know who the
> spy/Secret Keeper was. He believed that it was Sirius Black and 
worked all through the book to keep Harry safe from him. 

Brothergib responds:

Agreed. The evidence suggests that Snape was not aware that Peter was 
the SK. Since it is clear that LV keeps his most important secrets to 
himself, it makes most sense that LV was the only one who knew that 
Peter was the traitor!

Carol again:
> If Snape went to Godric's Hollow to warn the Potters, he'd have had 
to
> know that Peter was the SK or he wouldn't know that they were in
> Godric's Hollow. But I can't imagine Peter telling him the secret, 
and he would surely have told Dumbledore if he knew. 

Brothergib again:
>From the mouth of JKR herself
'..Thenceforth nobody else - not even the subjects of the secret 
themselves - can divulge the secret. Even if one of the Potters had 
been captured, force-fed Veritaserum or placed under the Imperius 
Curse, they would not have been able to give away the whereabouts of 
the other two. The only people who ever knew their precise location 
were those whom Wormtail had told directly, but none of them would 
have been able to pass on the information (JKR)." 
I agree that it is very unlikely that PP told SS where the Potters 
were. I do believe that up until POA, SS was not aware the PP had 
been the SK. If we also take JKRs comments above as gospel, it would 
also suggest that DD did not know where the Potter's were either.
It is possible with this scenario that SS overheard PP (without 
actually knowing it was PP!) telling LV about the Potters, but that 
is a bit of a stretch!

Carol again:
 > My own belief, based on Snape's statement about James Potter's
> arrogance in the Shrieking Shack scene in PoA, is that Snape tried 
to
> warn Potter *before* the Fidelius Charm was in place, that he 
believed
> Sirius Black to be the spy and James refused to listen to him
> (rightly, as it turned out). 

Brothergib again:
The problem I have with this is that Lupin states at the end HBP that 
they trusted Snape because DD trusted Snape. This statement suggests 
that the OOTP did not personally witness the double agent role that 
Snape played during the first war. It makes sense to me that DD would 
not have let the others know that Snape was a double agent - all the 
evidence of DD in these books shows a man who lets people let know as 
little as possible of his furture plans. Therefore, the Potters would 
still regard Snape as the enemy!

Carol again:
> 
> If someone who likes this Invisibility Cloak theory *and* believes
> that Snape is DDM can reconcile these conflicting elements for me,
> please do so. 

Brothergib again:
It seems likely that when James & Lily decided to go into hiding, it 
is possible that DD may have asked for James cloak so that other 
members of the order could use it if necessary. Since James would be 
under the Fidelius charm, he would not need it. That seems the likely 
reason why DD had the cloak.
I do not believe that PP could ever have revealed the location of the 
Potters to SS. However, it is possible that LV may have boasted that 
he was going to prevent the prophecy from occurring. SS may have told 
DD that LV seemed to know where the Potters were and he was going to 
finish them off. Maybe DD gave SS the cloak and asked him to try and 
tail LV.
The huge problem here is that when LV gets to Godric's Hollow, he can 
enter and attack the Potters, whereas even if Snape manages to follow 
LV, he would not be able to find the Potters, even if he was in their 
house!