The only move to avert disaster is 12...Ne5. But after 13.Qxb7, Black's position looks shaky.
13.Qf5! Ne5 14.Nxd4+ Kd8 15.Ne6+ Kc8 16.Rxe5! dxe5 17.Nc5+ Kb8 18.Nd7+ Kc8 19.Nb6+ Kb8 20.Qc8+ Rxc8 21.Nd7#.
Ironically, the final position is Philidor's Legacy! I think Morphy knew what he was doing when he played 4...Nc6 instead of 4...exd4.