A resident of a provincial Ural town, Anton Zuev, finds in his mailbox a package with an incomprehensible ring-shaped object made of white metal. The strange ring cannot be scratched - the trace of the industrial diamond will be delayed, nor thrown away - it will definitely be returned. Automatically putting it on the wrist of his left hand, Anton becomes a completely different person - a participant in a ruthless battle for power over the world, a member of the ancient Brotherhood of the Lords of Probability.