Sumara, the head of the criminal investigation department, is investigating the case of a girl who was found covered in snake blood. Coincidentally, the girl is studying archaeology and is conducting excavations at the nearby Podlažice monastery. The magical number 666 was written in blood on her forehead, and her body was wrapped in a snake coiled around an egg. This prompts the involvement of Dr. Runa, an expert in magic and the occult. The incredible mysteries surrounding a satanic cult and the creation of the Devil's Bible begin to unravel.

An adventurous story about traveling through time and friendship across history. One summer morning, siblings Klára and David find a frightened little boy in front of their parents' cottage. They would like to leave the care of the strangely behaving child to someone more mature, but they are alone, so they have no choice but to take little Artur under their wing and try to return him to the place from which he wandered off. That same morning, another unusual visitor arrives at Dr. Hávová's veterinary clinic. A man whose behavior is somewhat unusual for today's world. He calls himself Robert and tries to pay for the food he has been given with gold coins. Independently of each other, the protagonists of the story uncover clues that lead to the cottage of a local eccentric named Kobza and further to a cave called Devil's Mouth. Is this cave really a gateway to another world and time? And will Artur and Robert manage to get back home through it?

这部时长83分钟的作品分为两部分呈现。它记录了索尼娅·维德-阿瑟顿的想法，即创作一系列来自中欧和东欧（包括俄罗斯）的作品。其中一些原本并非为大提琴而作，但她还是安排人将其谱曲。还有一些是为人声创作的歌曲，索尼娅·维德-阿瑟顿在她与尚塔尔·阿克曼合作的早期影片中曾表示，她希望以一种能让大提琴体现出人类声音所具有的独特情感的方式来演奏它。在开头，她解释了她认为该地区的每个国家在其音乐中都体现了各自独特的个性，这些个性源自其各自的历史和文化，但该地区每个地方也正如她所说“被其他地方所影响”，因此总会有一些共同的元素贯穿始终。