Keeper of the Sun

Millennia ago, a great ancient civilization flourished. A magical ritual with two golden coins allowed the Chief Keeper of the Sun to extend the ruler's life. However, the ritual coins were stolen by savages, and the state fell, losing the sacred artifact. The relic itself was lost to the ages… 
In modern St. Petersburg, amateur detective Nadezhda Lebedeva finds herself caught in a whirlwind of dangerous events. In the Hermitage, she is drawn to an unusual exhibit — a gold coin, the oldest of those discovered. An unknown person steals the coin, and the next day, the charred body of the main suspect is found. All leads point to a mysterious man who seems to have deceived time itself.