At GZ you will find a village sign and if you look across the road you will see the remains of Marham Abbey. On the village sign in Marham you will see at its centre a ghostly nun. The nuns at Marham were anything but saintly and generated the ghostly tale of Sister Barbara, whose ghost is said to be seen on gliding in Marham.
It seems that Sister Barbara had somewhat lost sight of her calling. Ambitious and increasingly fond of the finer things in life, she devised a plan to create a sustainable income revenue to fund a lifestyle not entirely befitting of a nun. Her plan involved paying men of ill repute to stop, rob and leave wounded any rich merchant who passed close to the abbey on the narrow, muddy track which passed a hill in Marham known then as Vinegar Hill. There were tall, dark hedges lining the road which linked Swaffham to King's Lynn, a perfect place for robbers to hide as they waited to pounce on unsuspecting travellers.
Once the attack had taken place Sister Barbara and her sisters of mercy would arrive at the scene and as the poor victim awoke from a daze, would see the benevolent faces of nuns staring back at them. Taken to the abbey to recover and nursed back to health by the nuns, the merchants and their families would be so grateful that they would shower gifts on the abbey and hail Sister Barbara as their saviour. The plan worked and the abbey grew rich and Sister Barbara's tastes even richer. After time, the monks at nearby Pentney Abbey caught wind of a series of suspicious events linked to Marham and, tiring of the tales of the nuns' miraculous abilities to predict when they would be needed most on Vinegar Hill, began watching them. It wasn't long before the plot was uncovered when a monk caught Sister Barbara paying a scoundrel for his services. Sister Barbara was sealed alive in the walls of the abbey. So on a bright November night, don't go anywhere near the path that leads up to Vinegar Hill, because a ghostly figure is seen walking along it!
The cache is not at these co-ordinates and the abbey ruins are on private property so please do not go to them, just view them from the road.
To find the cache find out when Marham Abbey was founded. (Google!). The date ABCD with give you North N52 39.(B+C)(C+A)(D-B)
Now find out the date when the abbey was dissolved - this date EFGH will give you the East E000 31. (H-H)(G-E)(F+G)