End of the Empire of Mages

The magical border once and for all separated the country of "sword and magic" from its ancient enemy - the state where technological progress flourishes. And it seemed that it was impossible to destroy this wall ... But now the impossible happened. The garnet is broken by an experienced magician magician. Almost all special agents in one way or another are removed from business. And, even worse, someone managed to copy and transfer to the "witching" side a secret document of great importance ...
How did this happen? And what to do to find and neutralize the offender and try to stop the brewing war?
The Supreme Advisor Lewis entrusts Darney - the only remaining specialist - to conduct his own investigation