The Secret Key

Agatha had known all her life: she was a born detective. Yet for some reason, those around her were not in a hurry to believe her, and a suitable case had not yet come her way. But one day everything changed. It happened on the day Agatha became an accidental witness to a real crime. The perpetrator sneaked into Hyde Park on a motorcycle and ran over a professor from the Royal Geographical Society. Moreover, London was shaken by a disaster: toxic red algae flooded the rivers and canals. And only Agatha knows that these two incidents are connected. However, she does not yet suspect that her family is also involved in these mysterious cases…