World-famous restorer Dmitry Starygin, following the encrypted instructions of his Spanish colleague Pedro Mendez, finds the Book of Secrets. The records of the ancient tome can only be read by a select few, regardless of what language they speak. Together with Mendez's student Maria, a girl with golden eyes, Dmitry begins a search for the most ancient artifact described in the Book of Secrets - the Holy Grail, which gives exceptional power to its owner. However, a descendant of the Polovtsian khans stands in the way of Starygin, eager to take possession of her, and therefore the whole world. Having poisoned Maria with a deadly poison, he demands to find the Cup in exchange for the antidote...