Sofia received a mail:

Quick background. Sofia and her sister rents out apartments. To be kind they did one guest's laundry for her.

"Hi Sofia,

Two of my socks seem to be missing since our laundry was washed. Have you, or your sister, by chance seen 2 mismatched socks? I have attached a photo to show you what my lonely two look like. If you have not seen them, oh well.

Thanks for looking,

Sarah"