An ancient medallion, which accidentally fell into the hands of a Red Army colonel in the spring of 1945 in one of the captured castles in Germany, will cause a whole chain of mysterious and inexplicable events that have haunted various intelligence services for almost half a century. A special mission unexpectedly falls to the lot of the colonel's granddaughter, the main character of the novel - police captain Natalya Rostova, who as a child often played with an amusing trinket brought by her grandfather from the front, not even suspecting how radically a harmless-looking "toy" would soon change her whole life. life. The novel unexpectedly and successfully intertwines elements of an action-packed detective story, a mystical thriller and a historical novel. New pages of history, sometimes unknown and mysterious, open up before the reader. Events and characters from the distant past, by the will of the author, as if by themselves, are woven into the cycle of seemingly incredible adventures and in the most unexpected way influence the fate of the novel’s heroes living among us. The main character of the novel will have to deal with inexplicable phenomena occurring at one of the border posts on the Finnish border, where Natalya Rostova serves as a dog service instructor. At the site of the ruins of a Templar castle, in one of the dungeons, “something” is unexpectedly discovered that clearly goes beyond the usual natural phenomena. What were the Nazis from Ahnenerbe looking for in these dungeons on the eve of World War II? Where did the Soviet reconnaissance group that landed in these places in 1939 disappear? On the way to answering these questions, the heroine, with her inherent resilience, will face loyalty and betrayal, love and dedication, hatred and cruelty. Throughout the entire story, the ancient relic of the Knights Templar will inexorably lead its owner to the denouement, continuing to leave a trail of blood behind it and taking away the people closest to her from the heroine. One by one. On this difficult path, the police captain Rostov will face many trials: a forest camp of “black diggers”, the spirits of an ancient crypt, diving to the bottom of the Black Sea and the remains of an ancient ship, an unequal battle with Crimean treasure hunters, unraveling the secret of his father’s notebook and, finally, finding a loved one...