The Sorcerer of Light Smoroda, a member of the Sorcerer's Squad of the Grand Duchy of Slovenia, is often brought in to solve operational problems facing the Novgorod special services. And now he has been tasked with finding out whether the suspicious girl who, along with numerous guests, arrived in the capital city for the celebration of Pilgrim Week is a Varangian spy. And at the same time, you need to deal with the murder of a scientist engaged in unconventional (non-magical) science and who discovered that spells are not omnipotent. Light gets down to business. He does not even imagine that as a result he will not only find the killer, but also make a discovery that seems to have no place in scientific theory...