They say that in ancient times, a great magician imprisoned a prince in a high tower, and so that no one could penetrate there, he made it invisible. She appears at sunset for one moment, like a mirage, and then disappears again. It is impossible to penetrate the tower, but many people tried to get there and free the prisoner. But none of the brave souls returned... This is the story that Angela and Sashka learned when they came to vacation in these parts. And they would have believed that this was just a legend, if incomprehensible and terrible things had not started happening in the area... Soon the guys realized with horror: they have the ability not only to see the invisible, hidden from the eyes of others, but also, thanks to Angela’s ring, influence the affairs of dark forces...