McGonagall might be the evil one

[jojobinks1983]

No: HPFGUIDX 91846

I probably haven't done my research properly here but is McGonagall 
in the order? She always seems suspiciously absent. Also, everyone 
else had an important task to do at the end of GoF, what did she do? 
You've got to admit she's an unlikely candidate for Voldemort's spy 
but isn't that sometimes the way?

Can you see the paranoia taking over?

Jo