On the outskirts of a dacha village, two boys, Stas Akulichev and Timofey Pankratov, met a young girl and could not even imagine that in front of them was a real vampire. But it turned out that even vampires are capable of brave and noble deeds. The girl informs the boys about the approaching time X - when the gates of the kingdom of night will open. To prevent this terrible event from happening, you need to find a magic crystal, but Christina is wounded and is unable to do this. The boys agree to help this strange stranger...