2013. Moscow. In the basement of an old mansion, the remains of an unknown person have been found. To examine the find, police officer Anton Ermolaev and forensic expert Ekaterina Luzina arrive. They immediately determine that the skeleton belongs to a person who lived in the 19th century. Taking everything they found as evidence and making their way to the surface, they discover that they have traveled back in time and are now in 1879.