Yippee! Penny and her friends are going to London. Thanks to grandma, of course, who won a trip for five people. However, they haven't even arrived properly and grandma's golden necklace disappears. And Emily, the tour guide, kept saying that they need to be very careful of pickpockets. And that's not the only theft. Everything indicates that they are dealing with a professional. Fortunately, all the detectives are here. The hunt for the culprit leads Penny and her friends to every corner of the city...