Mary worked in a bar kitchen. After becoming a housewife, she gradually likes hunting treasure.
On Sundays, Mary would bring a metal detector, together with her 33-years-old son Mike, come to the Hertfordshire nearby fields to their six hours regular treasure hunting.
Within seven years, Mary and her son's treasure hunting activity never stopped. Her metal detector searched through almost every inch of land on the outskirts of Hertfordshire, but no achievement all the time. After seven years continuous explorations, she finally found a 500-years-old gold thin piece, valued more than 250,000 pounds.
The thin gold has the length of 2.8 cm and the width of 2.3 cm, with high quality, carved with the Father, Son and Holy Spirit "Trinity" pattern on the front. Historians speculate that it may be a 15th-century decoration.