Milena Vass (Lena), a young detective from Krasnoyarsk, suddenly finds herself at the center of a supernatural conflict while investigating the theft of an ancient artifact. She discovers she's a Guardian - an heir to an ancient lineage tasked with maintaining the balance between worlds.

Now Milena must find answers to numerous questions: How can she master her new abilities? Who's behind the theft of the mysterious Fiery Heart of Yenisei? Why is the demonic Gregory Petrov so interested in the artifact? Who is the enigmatic Igor, and can he be trusted? How can she balance her duty as a Guardian with her growing feelings? And most importantly - can she prevent an impending global catastrophe before it's too late?