Unexpected queen sacrifice

I overlooked the following neat idea while playing a blitz game today:

White to move
In this typical Spanish structure, I erred with 27. Rxa8 Rxa8 28. Qf7 which brought me nothing after Qd8. Disappointed, I lost the game. Instead I had the brilliant queen sac:
27. Qf7!!

  White threatens Qg8 with mate, and otherwise Black has to give up two rooks for the queen:
27… Rxf7 28. Nxf7+ Kg8 29. Nh6+ (the point) Kf8 30. Rxa8+ Ne8 31. Rea1 White is much better:
Bishop will be transferred to g4, White controls the only open file and Black’s kingside pawn structure is damaged. It won’t be easy…