Find the win

Find the win for White
     - from Kings, Commoners & Knaves by Edward Winter

It would seem immediately obvious that White mates quickly by 1 Qxh7+ Kxh7 2 Rh3+ Kg6 3 Ne7#
or 1 Ne7+ Kh8 2 Qxh7+ Kxh7 3 Rh3# or 1 Nf6+ gxf6 2 gxf6+ Kh8 3 Qxh7+ Kxh7 4 Rh3#

Standard mating combinations - but there is no mate. All the above variations are impossible owing to the pin by Black's bishop on b7

So, the winning line is... ?

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