His sister was going to the City-Of-Ravines the next morning to visit someone (Igor didn't really care about who it was). Do you know where? Right: at the Tower-In-The-Middle-Of-The-Street! Igor asked if he could go with her to fulfill his dream. After all, he was already 15 years old and knew little, almost nothing, about the City-Of-Ravines. By following his sister, who knew the city pretty well, everything would be easier.
So, they went there!