Lost Mine of Phandelver
Mirna told the heroes that she might know where a valuable heirloom is hidden. When she was a young girl, she and her family fled from the town of Thundertree after undead overran the place. Her family had an herb and alchemy shop, inside which a case containing an emerald necklace was hidden beneath a section of storage shelves. She never dared to return and retrieve it. The shop was in the southeast part of Thundertree.
The Seekers travled to Thundertree Ruins on Uktar 18, 1491 DR and recovered Mirna's necklace. However instead of keeping ot for themselves they returned it to Mirna, earning her gratitude and thanks heartfelt assurance that she would make sure the trading post at Hillcrest was a success.