Five weeks ago, Alex and Einstein left in search of Alex's missing parents, world-famous archaeologists. Rebecca and Joe are terribly worried that they haven't been in touch. Finally, Rebecca and Joe receive a short message from Alexander: “I’ll be back tomorrow!” True, at the airport it turns out that Alex not only did not find his mom and dad, but also disappeared... Meanwhile, in London, the inexplicable is happening: city buildings are blowing up one after another. Even the famous London Eye drowned in the Thames! Police Inspector Clash is confident that Alexander's disappearance is somehow connected with the emergency situation in London. But Rebecca and Joe aren't ready to wait for an official investigation when their best friend is in big trouble. They will hold their own!