Kreacher: Prophet, Plotter or Pawn?

[thelinnealand]

No: HPFGUIDX 86871

In Oop, Out of the Fire, Harry has been talking with Kreacher who
duplicitously tells him Sirius is not there.

"But you know!" shouted Harry. "Don't you? You know where he is!"
The was a moment's silence, then the elf let out his loudest cackle yet.

"Master will not come back from the Department of Mysteries!" he said
gleefully. "Kreacher and his Mistress are alone again!"
 And he scurried forward and disappeared...

Granted Kreacher knew of the plot to lure Harry to the DoM from his
visit with the Malfoys. Granted also that Harry suggested that Sirius
was there already.

But why, or how, did he know that Sirius would truly go and then not
return??? 

Linnea  Lyn NAY uh