Who knew that Peter was the Secret Keeper? (Was: After all this time...)

[potioncat]

Mooseming: 
> Agreed it all points to a spy in LV's ranks. Admittedly here I 
> struggle with the concept that the spy could remain ignorant of 
> Wormtail's identity and warn Lily and James in person (the `Snape 
> warned James but James was "too arrogant to believe (he) might be 
> mistaken in Black"' theory I'm rather fond of!). At this point I 
> have to fall back on the idea that not only did Wormtail tell LV by 
> sending him a note but that LV left it hanging around and Snape was 
> able to read it even though it wasn`t meant for him

(which is why 
> Moody torched Harry's note btw). Not the neatest of plotting and 
> rather too much use of the note approach but will suffice at a push!

Kathy W:
(Be kind, I'm in over my head here.)
But, we don't know that Snape warned Lily and James in person. He 
could have told DD who tried to get Lily and James to change SK. When 
they didn't (only they did) Snape felt his news was rejected.

Or Snape told them in person, "before" the charm was put in place 
(therefore, before there was need of a SK to find them) and felt his 
information was rejected. Actually, he would have had to tell them 
before the charm was cast, because that was the whole point.

His being at GH...if he was...could have been because LV took Peter 
and Severus with him. 

Now, how does Sirius know so much when he gets out of Azkaban, but he 
doesn't know Snape was a DE?