Harry is back for his second year at Hogwarts amid mysterious doings involving a hidden chamber somewhere in the castle that is inhabited by a monster intent on killing students who aren't pureblood wizards.
Hermione's cat, Crookshanks isn't pureblood cat.
The pureblood Ruman population, noble and plebeian, inhabited the cities and towns or larger villages; the peasantry were mostly of Little Russian and Hungarian race, and were in a servile condition.