The Secret Key

Agatha has known all her life: she is a born detective. Yet for some reason, those around her were in no hurry to believe her, and a suitable case had not yet come along. But one day, everything changed. It happened on that day when Agatha accidentally witnessed a real crime. The criminal infiltrated Hyde Park on a motorcycle and knocked down a professor of the Royal Geographical Society. Furthermore, 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 affairs…