Lady Prigsbottom is staying at the Mill on the Marsh while her big, posh house is being done up. She has brought all her valuables with her, which she claims are worth millions. Great Aunt Loretta has volunteered to do some cleaning and is getting under Lady Prigsbottom's feet. Suddenly, Lady Prigsbottom notices that her diamond necklace is missing and instantly suspects Loretta.

Grandpa is indignant, so he shrinks to find out who the real culprit is. Then Loretta discovers that her shiny beetle brooch has also gone missing, and so has Auntie Jules's little silver lighthouse. Grandpa hides in the sitting room and spots the thief - it's a bonglebird. He gets on Gordon the seagull and flies up to the bird's nest, where all the loot has been stashed. Everyone is very happy to get their things back and Lady Prigsbottom apologises to Loretta - as well she might. Show less