What will happen to a world in which the slave system flourishes if an underground revolutionary and a world-famous scientist find themselves in it? Century from the 19th? Class enemies who need to become friends in order to survive. Will they be able to do this if one is driven by a thirst for justice, the other by a thirst for knowledge? And won’t the price of the principles of the first and the research itch of the second be too great for the world?

Author’s notes: This is a kind of side-story to the “Osteria” series Old horse". Other heroes, different circumstances, different time. But the Universe is the same. On the good side, it makes sense to read after "Kyata" and "Bravatta". Much becomes clearer and prepares again for the third book of the series))