In 1918, when the royal family was waiting for a decision on their fate in the notorious house of engineer Ipatiev, the young Princess Maria Nikolaevna gave one guard a medallion with her photograph as a souvenir. She gave it as a token of gratitude for the fact that he had not lost his kindness and compassion, was not afraid of prison and execution, standing up for the daughter of the overthrown, hated autocrat. The princess died. And the medallion went on a journey, changing guardians, intertwining their destinies, pushing people to meanness and exploits. Having emerged from oblivion in the twenty-first century, he again became the cause of criminal passions and even several murders. Captain Stanislav Avdeev and his colleagues will have to work hard to unravel the tangle of events whose threads entangled the fatal medallion...