When down in the castle dungeons, checking on a couple of the inmates, I noticed scrawled on the walls, the following message....
One required equation.............zero equals nine or x..........insert several extra numbers into new example. Eventually revealing how the offering was traced.
It didn't mean a lot to me but then I noticed a storage chest from the kitchens was missing as were some of my priceless artefacts. It seems that the butler has been up to his old tricks!!! It seems most probable that this is hidden at N51 27.??? W002 27.???
You can check your answers for this puzzle on GeoChecker.com.