harry's next journey
in the 6th book hbp harry finds that voldermort has devised a way of splitting his soul and placing the remnants into various objects we found that in the chapter after dumblebore dies that the locket they found contains a piece of paper with the initials RGB i believe this person to be sirius's brother regulus and he's not dead he knows where the locket is.
if regulus is dead then kreacher knows where the locket is, remember that cupboard in the kitchen that kreacher keeps bringing objects too ! are there any ideas ?