Lot twelve is a small blue vase that nobody expected to sell. Greta owns the shop, Dev is hoping for some old stamps and Cora has come to watch. When lot twelve is called, it is not there.
What happened
The vase was packed away in the storeroom, wrapped in bubble wrap.
Greta Vosantiques dealer
Dev Ramanpostmaster
Cora Lindqvisthead gardener at the allotments
The clues and your notebook open together. Time only counts while the case is open.