Stone guards. The first key

Who is really Ulysses Moore? And what kind of mysterious whale sailed into the Kilmor bay? Jason, Julia and Rick are about to recognize this. But the insidious Obliya and Manfred, who survived after the next fall from the cliff, are also about to fulfill their dream: they will penetrate the villa of the "Argo" and pass through the door of time. Only Black Volcano, Obossi"s old friend, can stop them. To find it, the guys will have to go to the twelfth century. It will not be so simple to return back, especially if their enemies follow the heels. And everyone wants the same thing: find the first key. Only he is able to open all the doors of the time. The fifth and sixth diaries of Ulysses Mura are even closer to the reader closer to the solidness of the secrets of the Kilmor Bay.
For secondary school age